I was unlucky, actually. At least at the time. I admit that now it has been a very lucky road, but when it happened... I left as part of a punishment meant to be kinder than another punishment. Both were death sentences, the one I received just let me live longer before the proverbial ax came down. The ax will still come, of course, that is the cost of becoming a Grey Warden, but I live much better now than I could have possibly imagined a year ago.

To answer your questions: the Templars as individuals range from kind to seeing maleificarum in every mage. As a whole the Templars are rather oppressive though they are tempered by their duty to follow Chantry law. They don't generally believe all mages practice blood magic, but they are taught to watch for it in every mage because of how easy it is to turn to. They often believe that not being willing to live a life watched by them, to want to live outside Chantry Law as an apostate, is the same as admitting to being a blood mage.

[He snorted.]

After all, what other reason could any upstanding person have for not wanting to live under constant guard?