I don't expect to win but I'd rather vote for who I want and lose than vote for who I don't want and win.
What about people who don't have that luxury, who may literally not make it to the end of a second Trump administration with their life undestroyed by it? Hispanic immigrants are the most obvious candidates, although honestly it could expand to encompass quite a few people.
Why are you not worried about Trump ending the democratic machinery that you might use to vote in a Green candidate in the future? Trump seems like just as big a disaster for third-party democracy as he does for two-party democracy.
Do you agree with Stein about disbanding NATO? Is that one of those things you would rather vote for and lose than etc etc? I actually think most of her platform looks excellent if it could be pulled off, but that one is a little bit of a random red flag in the mixture.