Then you do the same to the next one. And the one after that. And the one after that. Until someone gets up there and decides he/she doesn't want it happening to them too.
The point isn't that there's "going to be another"...that's just defeatism. The point is to make them realise that they will NEVER be safe. That there are people willing to do anything to see them strung up by their ankles in a town square.
Courage is contagious.
50 years of cuts to the education system and the demonization of the Liberal Arts (history, sociology, etc...)
A country that would rather keep a football program than an arts program is always going to suffer.