If by chance people could take a step back and imagine a world where they're without power (like yourselves now
) Then imagine that mages walked the earth who could do unimaginable things and worse still, practice in the dark arts of blood magic the very idea if witnessed in real life would scare the living ****** out of anyone, then you would understand why I chose to join the templars. Fear motives the actions of man. I think, in realistic terms, most people would fear and loath mages. I chose the most realistic response. I think the fear itself would also be born out of jealousy so you're dealing with the hatred of mages on two fronts. The fear of being controlled by others more powerful and the fear stemming from jealousy that they are so powerful.
....and also 50% of this community are mage players. I like to think I'm destroying most of you 
Just because one or two mages revert to Blood Magic does not mean all mages do.
Anders awakened my eyes in DA2 after Hawke's mother. When my Hawke responded, "Maybe the Templar's are right." Then Anders said, "If it will make you feel better then blame me." I thought on that and changed my opinion.
I love mages, I agree with the rebellion. I however do not like Blood Magic or those who practice it. I have ZERO problems zapping to death another mage using such arts.
Furthermore I believe Andraste was a mage and her famous words, "Magic should serve man, not rule over him," were taking out of context. I believe those words were meant to say, use magic but use it to help people not vi for power.
The Chantry uses the Mages as means to gain their highest source of income and they allow Templars abuses towards mages to go unchecked with out even a tongue lashing. Ser Alrick was going to rape a young mage, and The Chantry finds that OK? And don't get me started on Grand Cleric Elthina, what a pain in my ass she was.
Do I hate all Templars? No. Thrask was at least trying to show that Templars don't have to be assholes to mages. Too bad most Tempars use their position and power to get away with treating mages like sh!t below their boot.
I for one would not want to be a female in a Circle. I'd end up sleeping under my cot, with a very large knife.
<Shrugs> But that is just my opinion.