@nixou: It can also beget civil resistance... but that might not be so interesting for a video game crowd who wants to solve everything through violence.
Well, yeah, but DA2 made it clear that Meredith was zealously crushing any and all form of dissent, with the notable exceptions of Hawke and Elthina, who were the two remaining authorities in town too powerful to be bullied with impunity, and even they were standing on thinning ice.
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But Anders isn't hailed as a hero. He's hailed as a loon. And rightly so, because his gameplan was to spur a genocide.
You don't need to be hailed as a hero by most: you just need enough people who regard your actions as heroic to follow you personally or follow in your footsteps.
And that's where oppression plays a role: recent studies by political scientists and historians have shown that there's a clear link between how oppressive established authorities are and the success of violent rebellions:
Relevant quote:
When both terrorism and counterterrorism inflict massive costs on civilians, the population is left with a choice of two bad options. Given that preexisting grievances are likely to have facilitated rebels’ mobilization efforts in the first place, governments are doubly likely to lose in such a contest.
Anders expected "the government" -in that case, the corrupt (and increasingly infamous about it) Templar Order- to overreact and crank up its persecution not only against mages but against everyone suspected of being a mage sympathizer, which in turn would push the population as a whole to reject them and side with the mages by default.
Had Anders' paranoia been completely groundless and the Templar Order half as honorable as it claimed to be, he would have remained a lone madman.
But the Order reacted exactly as Anders predicted: its local commander used the murder as an excuse to commit the massacre she already wanted to commit, then the other branches cranked up the oppression while treating with utter contempt the more level-headed authority figures' calls for restraint, and by the time Inquisition rolled in, Templars were executing farmers for the crime of wearing a shovel and on the verge of pledging themselves to Corypheus.
And all that for what result? No matter who becomes the next Divine, by Trespasser's end the Circles no longer have full control over southern Mages, with Vivienne's political maneuvering -Not the Templars' unfettered violence- being the reason there's still a vestige of the Circles to begin with.
So yes, in the end, a clear majority regarded Anders as a loon, but that didn't stop the rebellious faction he inspired to emerge victorious in the end.