I could (as you & almost everyone else has done multiple times to me) just cut this "inconvienient" bit out when quoting you but instead I'll say that Harrowmont wishes to preserve tradition, hardly a bad thing if you ask me (just ask the Elves or anyone from Ferelden for that matter), he may be a bit stuck in the past but that hardly makes him less moral than Bhelen's overagression & violent zeal.
The difference between the elves and the people of Ferelden wanting to preserve tradition and Harrowmont wanting to preserve it is what that tradition is.
If you go to the Shaperate, you can get a very good idea of what that tradition is.
Warden: Do you know anything about this "carta?"
Shaper: I cannot discuss this so-called "carta." It is a criminal gang not acknowledged in the Memories. Its members are casteless and do not exist.
DN: I am no stranger to Orzammar, my Lord Shaper.
Shaper: Your exile is written in the Memories, Warden. I am sorry, but Orzammar cannot be your home, nor I your shaper. We must all obey the ancestors' rules.
Warden: What about the casteless?
Shaper: The casteless descend from criminals and those repudiated by their own families. Or who chose to go to the surface and live by human laws. They have no ancestors to guide them and no families to claim them. They should not have been born. Their parents defied their shame and brought cursed children into the world. It's better they die young.
(Warden: It seems easy for you to dismiss them.
Shaper: Their births are not recorded in the Memories. In Orzammar, they do not exist.)
or
(Warden: I can't talk to someone who thinks that.
Shaper: Our beliefs have kept us through four Blights and countless kings. Consider that before you dismiss them.)
or
(DC: Is that what should've happened to me?
Shaper: I'm sorry. I can speak with you as a Warden, but I cannot discuss your belief that you have previously been to Orzammar. Your presence here was not recorded in the Memories. You do not exist.)
It's pretty clear that he's not just spouting off his own opinions (and he won't give them at all even though he hints at wanting Harrowmont to be king). He's telling you official Orzammar policy and tradition. So many people (exiles, casteless, surfacers) aren't even acknowledged to exist. The casteless aren't allowed to have legal work. THOSE are some of the traditions that Harrowmotn wants to uphold and it's killing Orzammar.