They're just better at dealing with them, in my mind. They probably have ways of dealing with abominations quickly and efficiently. If not, the whole empire would have gone up in flames a long time ago due to the high usage of magic.
They still have the bloody right of annulment!
Aka the rite where the Templars kill every living thing in the tower and destroy the circle completely!
Outside of circle apprentices learning their craft, how often do we even see a combat spell like that backfire?
The Scene in the calling where the mage actually kills herself by making a flame spell so intense and powerful it kills her too?
Or the scene in the comics where The Blood mage Titus Basically maims himself to preform blood magic at last second and basically collapses from blood loss?
Seriously, that was a circle trained senior Magi and a bloody Magister.
It happens to ALL mages apparently, if they aren't bright.