Are we really going to play this game again? The Dalish codex is quite explicit that humans were and are considered "pests". They're actively waiting for human society to collapse and die out. There's only one group of people IRL that uses that kind of language to refer to other groups, and it rhymes with "pinhead". Then there's the Dalish belief - their honest religious belief - that humans are a walking plague. Not even white supremacists think minorities poison them by existing. Then we have their views on inter-mixing of races, which is to say that they think that romantic entanglements actively destroy the elven race; this is exactly what IRL racists believe about "whiteness". Substitute elf for white and human for your racial minority group of choice, and you've got a politely worded KKK manifesto or Stormfront post.
The Dalish codex about Arlathan explains that the ancient elves looked down on the humans as brash, impulsive, and warlike, so I'm not certain why you're bringing up the perspective of the Arlathan elves in relation to modern Dalish, who have contemporary issues with Andrastian humans due to the criminalization of their religion and the general hostility shown towards the Dalish clans. In regards to the quickening, we don't know whether or not humans were the catalyst for ancient elves losing their immortality.
As for the children of elves and humans being human, that was decided by the developers. I'm not certain why you're blaming the Dalish for something that is part of the lore. Slim Couldry, Alistair, Feynriel - all of them have elven parents, but all of them are human. I also disagree with your notion of racial purity. You're equating the idea of biologically-motivated racial preserving with an ethnocentric sense of racial purity, which isn't the same thing. Saying "We must preserve the white race because it is better than the brown people so no white people can have children with brown people" is radically different from saying "If elves don't have children with elves, elves will physically cease to exist forever as a species".
There's one defense to this virulent form of racism in-setting - that the elves really are different, whereas IRL race is a social construct. But that's irrelevant. If it turns out that race isn't a social construct - and there are more than a few biologists out there who argue that IRL racial groups aren't just social constructs - we don't owe skinheads an apologize. They don't suddenly have the moral high-ground because their racism may be tied to real differences between groups.
Elves and humans are not part of the same race; they are two different species who co-exist on the same continent in a fantasy setting. I'm not sure why you are confusing humans and elves for different ethnic groups in the real world.
You don't see how historically murdering humans for having the temerity to exist in your presence vilifies a group of people? I'm actually shocked that your justification is that it's OK 'cause the Dalish are just historically in favour of racially-motivated murder.
You could try addressing what I actually said, instead of distorting the facts like you usually do. As I pointed out, Tamlen and Mahariel confronted three humans who were nearing their camp because they thought the humans might be a threat since, as I pointed out, Andrastian humans have historically been a threat to the Dalish. In fact, if the three humans are spared, they incite a village to attack the clan, which is why Clan Sabrae has to pack up and leave immediately.
It's absolutely one-sided. We're not debating the merits of vigilante justice here. The events that took place were hundreds of years old. There were people there who were guilty: the ones who raped and killed his children. Their family, and their children were completely innocent .And that was however many hundreds of years ago. In exchange for two lives, Zathrian committed a crime unspeakably horrible. He actually succeeds in pulling ahead of Loghain on this front, and Loghain is a slaver. The Dalish elves in his own clan who Zathrian is allowing to die and/or be transform into werewolves all to hide the fact that he perpetrated a blood mage curse are completely innocent. Zathrian is letting his own people die for the sake of taking revenge on a group of people he's already killed centuries ago. He's a monster.
First off, Zathrian doesn't make it privy to anyone in the clan that he is responsible for the curse that is currently infecting the werewolves, so you're being dishonest in claiming that the entire clan is hiding this fact; as the Lady of the Forest points out, no one in the clan even realizes why he's immortal - which is a result of the curse.
Second, something monstrous happened to Zathrian, and he did something monstrous in turn. As I said, it doesn't excuse what he did, but you were acting like Zathrian did it out of the blue until I pointed out the context of what happened. And now you're trying to place blame for Zathrian's actions on the entire clan, which is simply ridiculous.
We've been over this point already. There's nothing more virulent and fundamentally racist than the idea that the mere existing of humans - in virtue of being human - is a plague on the elves. Not even racist white supremacist manifestos go so far as to say that non-white minorities are the literal equivalent of plague bearing rats.
You also think the fact that elves and humans having human children is racist, but that's part of the lore. At this point in time, we simply don't know whether or not the quickening actually happened, but regardless of whether or not it did, it certainly doesn't cause every Dalish to view humanity with disdain; the child who became Aveline wouldn't have been adopted by the Dalish if that was the case, nor would treaties have been signed to aid the Wardens during the Blight, or one the Dalish clans having a "semi-permanent settlement" in Rivaini neighboring humans who follow the Natural Order.
These hypothetical moral, upstanding Keepers have yet to be portrayed in a DA game.
Keeper Deshanna Istimaethoriel leading Clan Lavellan to rescue the Wycome humans and elves doesn't count?