No one is stopping us, the question is who is stopping others:

Trudeau called the mosque shootings in Quebec a "despicable act of terror"
Trudeau called the attack in London an "incident" but at least he gave his "deepest condolences to the victims of this cowardly attack".

Barak Obama was no different. Maybe this is the problem many have.  Our political leaders and media seem to walk on eggshells when these attacks occur and many do not believe this should be the case.