Yeah for example like tevinter eee no that is bad example or maybe zathrian , merril , marethari velanna or Quentin... But lets be honest even if mage blow up the city for money it is because mages are vilified 
it is everything templars fault! 
But to be serious damn how many times i have to say it isn't about evil or good it is about explosion...
So?
I wouldn't care still a threat to me.
Have you read the comics and novels?
er, why did you mention marethari? The woman sealed the demon to save Merrill. That's a pretty big plus Imo.
Tevinter mages like Dorian and Maevaris, acknowledging that the current path tevinter is on is destructive and needs to change again, another plus imo.
Not all mages go boom either. Its been proven. The only time a mage goes nova is when they're pushed into it by fear and anger.
obviously im not referring to mages seeking destruction ala Anders, or Titus, but in addressing your walking time bomb concept.
Also, regarding child, poor kid.