Allan Ross,

The difference with this incident was that the violence was aimed towards those who held advantages in society - middle class feminists.  It wasn't aimed at women simply because they were female. It was aimed towards women because Marc Lepine saw that feminism was doing much harm within society, changing the very fabric of society by having women taking non-traditional jobs and careers previously reserved for men. 

Feminists held no compassion for men they pushed out, they simply reinterpreted Marc Lepine's abilities and skills to gain advantage in this situation, saying he wasn't good enough to get into the Polytechnique. He wasn't good enough, but not because he wasn't capable. He wasn't one of them. He didn't drink or smoke and didn't behave as a lot of university students did, and still do. He became violent, but he had few resources, and no way of dealing with this life-changing situation that had happened - not getting into engineering school at the Polytechnique.