I think Meredith went over the top, but she was a little crazy from the idol. However the Kirkwall Circle was dire, nearly every mage in it or around it was a Blood Mage, including O, who helped the guy who killed Leandra.
First time through I sided with the Mages, but this second play through, I'm totally going with the Templar.
As for listening to Hawke, maybe those in Kirkwall would've, but they've all gone pretty much, either dead or fleeing. The other Circles and Templars? Why would they listen to Hawke, none of them know him.
The Divine has or will, declare a holy war against the Mages, I think we need a new hero, one more than just a normal Man, Elf or Dwarf.