My opinion is, you don't ever have to be outraged by an oppressed group's acts of violence, because you should already be outraged at the existing and continuing violence being done against them, and that arguing for the side of the larger militarized occupying force - even if your convictions are pure - isn't helping the folks who're oppressed as much as you think it might be.
Like, maybe wait a little while before adding fuel to a flame, especially if you're gonna start saying wild shit that sounds a lot like "if colonization happened long enough ago it isn't my responsibility".