Many live who deserve to die, and many die that deserve to live...can you give their lives back to them? Then be not so hasty to deal out death in the name of "justice."
If you really, honestly think that people who don't like us/you deserve to die simply for that opinion/feeling - please do us all a favor and get lost. You do not deserve a place among rational society. You miss the fundamental truth that you are no different and even possibly worse than the object of your derision. There is the possibility that they hate us/you with reason, yet you who would take their very lives, only do so out of pride, vanity and emotional ignorance.
THAT is the kind of person that commited this crime today andTHAT is what you would have us become. For your own sake, muzzle your hatred until you have the courage to see where it comes from.
"Justice" is not dispensed in anger, hatred or bigotry. When you act in these, you too become a terrorist: death is your goal and reason your enemy.