Was the teacher here right?

When that student stood up and expressed his thought about everyone having a right to live, and the teacher told him to "Get out", was the teacher correct in your opinion? Or should he have handled it differently and even at least partially agree to his position?

Also...

Did that guy really deserve forgiveness for murdering the girl even after being imprisoned for it?

Or were those people entirely in the right to demonize him like that for it? Or at least - understandably so?