why white men murdering their way across the American landscape are heroes worth rooting for.

First question isn't why you should root for them, it's if your objections should preclude them from being rooted for. And that's a big no. Every group in history has "murdered" lots of people. These fuckers only give a shit when they can use it as a wedge to hate on the Hwites some more. So the objection is dead on arrive, since it's inconsistent, and not in good faith. If you want to convince people who don't already hate white people that Hwite Man Bad...at least come up with an actual argument, you fucks.

Also, white people have been the most successful at turning that "murder" into positive outcomes, including relative peace, freedom, and prosperity.