I hope you're not being serious over here, are you? You must be pulling my leg.
Loghain Mac Tir (none mage) betrayed his entire country by walking out during an active battle, and left his King and his people (Including a Grey warden commander) to die at the hands of the Darkspawn. Look how many people had died in Ostagar because of what Loghain did. He framed the Grey wardens for the death of King Cailan Theirin. He along his puppy dog: Rendon Howe hired group of assassins to murder the 2 surviving gray wardens, and had they succeed in murdering them the archdemon would've been untouchable since it requires a grey warden to sacrifice themselves by successfully slay the tainted dragon.
Should I also mention Knight-Commander Martel and Knight-Commander Meredith? What about the events that happen in the novel: The Stolen throne? None mages causes far more fatalities than mages due to greed and lust desire for power.
Do you realize that you are comparing people in completely different stratas of the social hierarchy? If you want to use the death toll caused by normal political leaders to prove their "perfidity" then you must compare with the death toll caused by mage political leaders; it's the equivalent of comparing the murders commited by Jack the Ripper with the deaths caused by the politics of the king of England.
And, as far as death tolls go, the mages have Tevinter which pretty much beats every other nation in Thedas.
Oh and lets not forget the Templar order. They slaughter people and elves for having different belief system. Anyone who doesn't believe in the maker is a heretic and must die.
I got this quote from "The World of Thedas" page 47:
"The old ways are disappearing, but the Chantry does not demand their removal or promote hatred against the old deities. The Maker simply stands above them."
What evidence do you have of Templars killing people for being "heretics"? I can think of one: Ser Amell and even Petrice disavowed him.
Oh, and then there is Brother Burkel who was killed by fellow dwarves for being an Andrastian.