It's the same reason why Bernie won't support "Abolish ICE" and decries "Identity Politics" and is super lax on Gun stuff. He's representing the second-whitest second-most-rural state in the US.This stuff rubs me the wrong way but I get it. I only get really grumpy when the rhetoric becomes borderline racist. As long as he actually votes the right way on winnable issues he's a lot better than a Republican.
Realistically, this is what a 50 state strategy will produce. You and I won't like what they have to say in order to win their state but the result will be better than what we have now.