Actually, neither clan took either of those people in with no question. Aneirin didn't live with the clan, and Feynriel was a favor repaid who also had an all but mythical type of magic. For a clue about how Dalish really feel regarding mages and them being dangerous, you have to look no further than Merethari's advice regarding Feynriel when he was in trouble. She didn't hesitate for a moment to suggest Hawke get in there and make him Tranquil.
True enough. It's ironic, but Dalish are very traditional in that regard. Blood magic is considered bad, Solas outright states that they do understand the difference between normal spirit and demon (and haven't a good opinion on the later), and even Vivienne approves when she knows that the Inquisitor had proper tutoring with a Keeper. That they consider that there's a limit to the mages one given clan can accept is not surprising in that context.
Contrary to previous misconceptions, it's very clear now that Dalish society is not Magetopia. Tevinter and Circle mages live in sheltered bubbles, be it because of power or a gilded cage, but Dalish have to live side by side with their non-mage brethren. Even the elf-only answers stress the importance of responsible magic.
And Solas, Vivi and the Creature Researcher can stare at you like you're an idiot if you do.
But Yeah you can say that 
To be honest, it's not because your answers are lies; Merrill's existence is proof of that.
Also, it's canon that the Lavellan Clan is that "weird" compared to other Dalish. I mean, at the beginning Solas and others are surprised that the clan was so interested in the outside world that they sent someone to get information about the Conclave. If the right choices are made, the Lavellan can end up fighting bandits alongside Inquisition soldiers, saving a Free Marcher city from red lyrium, refusing to leave that city because that would mean abandoning the City Elves to be killed by the invading army (it was an army of misguided Marchers, so the humans were safe), and, finally, becoming part of the Council that will rule that city from that point onwards, alongside City Elves and humans.
Seriously, I didn't expect that. And it offers new alternatives to centuries-old dilemmas in Thedas.