I didn't feel sympathy for them to begin with. It always puzzled me that people on here decided to champion the mages when they have it so much better off than so many other groups. Unlike your average serf and especially the city elves they are afforded many luxuries. Free education, good food, a warm bed and a roof over their head every night. Yes the circle has it's nastier aspects as well, but they still have it far better than those outside the circle who aren't fortunate enough to be born into nobility. They don't have to fear starvation, dying alone in the cold, disease (due to magic,) not having enough gold to pay for food, shelter, their taxes etc, and many other horrors those on the outside face regularly.
Their condition is the reason most cannot or do not leave the circle (although we know mages can and did with the exception of Kirkwall, until the Anders incident that is...) They can burn down villages, bring bad harvests, kill many people. "Anybody can do that! " Some will say, and it's true, but here's the clincher. Mages can not only do these things quicker and more effectively, but they can do so without meaning or even wanting to. They risk becoming an abomination whenever fear or anger completely takes over them.
Inquisition was the mages chance to prove they were worthy of freedom and the responsibility that comes with it. They were given free harbour and protection by the monarchy of Fereldan, who gave them their most defensible keep. They betrayed them, alligning themselves with the known enemy of the free world (as their slaves, no less) Kicking their protecters out of Redcliffe altogether. So no, I have no sympathy for the mages.
It isn't even that they allied with Tevinter (though believe me that is bad enough as it is.) It is the betrayal of those who trusted them when nobody else would and the fact they accepted indentured servitude (or slavery, something they never were in the circles.) They showed that they didn't really care about freedom, so long as it was other mages holding the leash.