Mm, yes. The main cast was convincing as a group of liberalish people who consciously think genocide is wrong, but don't know what they're talking about and have absorbed a bunch of stereotypes in childhood without ever going back and interrogating them. Unfortunately, the episode supports that viewpoint as the "most right" one. About half the problems that episode has might have been solved if the writers had spent another ten minutes researching the Chumash to find out about little details like them not all being dead after all.

Although it does seem like they should have known better, considering they actually had a line about how this wasn't the homestead being attacked (or maybe they said Alamo - totally the same groups involved, right?), and then led the episode to exactly that conclusion. How much more blatant can you get with the "actually, the stereotype is totally true!" moment than that?