And what if someone voted for Stein as a signal of support for voting reforms like ranked choice voting or proportionate representation necessary to actually fix these root problems?

How about if they voted in a state in which every elector was already going to vote republican anyway?

Or what if they voted to protest against Harris being chosen without a primary vote, against the basic principles of democracy? (And from a party so unwilling to pay attention to the situation on the ground that it had to wait until nearly the last moment just to be able to admit that Biden wasn't going to make it.)

I can see a lot of reasons to try sending a message that way, and as far as I know Stein didn't cost democrats the vote in any state, and certainly wouldn't have cost democrats the vote nationally even if the overall popular vote mattered (which as we all know, it doesn't); your message is extremely reductive and frankly seems like a purely emotional attack. You really aren't elevating the discussion.

This sort of rhetoric always rubbed me the wrong way, but it falls completely flat on its face now, given that there isn't a single state in the US where the margin of victory was anywhere close to being within the Green vote. The idea that a single-issue voter on something like Palestine is an implicit Trump supporter because of the issues you care the most about is just asinine. Heck, I suspect many of them are the ones most likely to be protesting. I understand that you are obviously going to view the world through your own politics, but I do feel obligated to mention that other people do, in fact, exist, even outside of elections, with all the depth that entails, and cannot realistically be understood with dualism.

Yeah, in exactly the same way that everyone who incorrectly thought Harris or Biden could win was supporting the actual Trump victory.

Even if they won't admit it to themselves.

/s