1. If someone is defending themselves they shouldn't be punished.
2. If they are fighting they should.
Pretty obvious huh? But look at it through the teacher's eye. Depending on the situation she maybe can't make it clear who was defending, attacking blah blah blah. So you see, it probably hasn't anything to do with liberal philosiphy. It's just that teachers can't do everything right. It's easier to take both and have a talk with them trying to sort it out (that's my motto; talking gets further than punishing in most cases), not blaming anyone until it is sorted out. It's just like the victim still goes to court (if s/he's still alive).
I can honestly don't see where anyone would want strict punishment on self defence. Meh, maybe it's just an american thing
Oh, thank good NEITHER liberals nor moderate conservatives rules Sweden xD (We have socialistic government, which also sucks arse, so hopefully left party (revolutionary socialistic) gets more votes this year <.<)
Wow, 10 replys while writing. <.< Can't bother to read it again and risk getting more replies x_X