Wow, thats a great reasoning.
This is a free forum, I can post my opinion just like you can.
There's a whole other thread, fifty pages worth, of nonstop Fiona spew.
You are right, going to TI is not tactical suicide. But they don't go to TI. They take over a castle in a location where they have no supply or reinforcement lines. Regardless of whether Fiona was in on that or not before it happed, the moment it did happen, it was obvious that Alexius didn't care about her people and therefore could not be trusted to uphold whatever deal he made with her. Of course she then proceeds to not try and save her people and just whimpers like a kicked puppy.
While preparing to retreat, likely across the water.
Anyway it matters sod all what people think of Fiona's decision. It was hers, not all the mages'. People who just want to punish all of them because they despise Fiona are poor leaders. As I said earlier, conscription benefits templars and allying benefits the mages, from a purely practical standpoint. Unless, of course, you just want to lock the mages back up once you're done with them. Which is where I suspect most of this mindset comes from.
That's fine. I also take pleasure in disbanding the templars, even though I think it's simply a pragmatic choice.