I think you should welcome (almost) anyone against an enemy like Trump.
I would much rather have the people who hate the Cheney's guts in my coalition than have the Cheney's. How many people do they even represent? Who doesn't hate them, and with good reason?
But not voting for Kamala because the coalition allowed Liz Cheney in is probably just as dumb
First off they didn't just "allow" Liz Cheney, they actively campaigned with her. But secondly and more importantly, it's not about whether it was right or wrong for that to influence people's decisions, it's about the fact that it likely did. Call it "dumb" or "irrational" all you want, if voters were all rational and intelligent then maybe we wouldn't have to think or care about messaging or image at all, but that's not the world we live in.
The influence of "bots" is highly overstated and is basically just a way of dismissing legitimate criticism and preventing any kind of self-reflection or learning from mistakes.