Suppose you're back in the WWII years and you just learn about German atrocities.

[TheKentuckian]

28. If we didn't go to war against Germany there would be no helping to liberate death camps

and no we did not go to war because of any such atrocities once already engaged no we weren't going to randomly leave the camps in place and obviously the territory of our allies would be freed.

The question attempts to reframe World War II into something it wasn't to set up a push poll. Native Americans nor atrocities had much to do with joining the war at all. In fact the reference to our behavior toward the natives is a weird ass counter anyway. World War I would come closer to a comparison but even that is dicey and not comparable to the Iraq invasion that folks of this mode of thinking love to say that was ten years ago which is one a small period of time anyway and two that they seem to forget either just ended or never did. In fact, I don't even know where ten years ago came from the invasion happened prior to that and the occupation didn't end in 2004 by any stretch of anyone's imagination.

The only real comparison here is that in both situations some bad people are doing some bad things, that is the only real parallel which means the poster is trying to herd folks into supporting the US as world police or to say some along lines of "fuck the Holocaust victims" or some such silly shit.