Etiquette of being "kingmaker" when you'll definitely lose?

I'm in a multiplayer trench game where I have virtually zero chance of winning. Opponent #1 has a rating of about 1300, and Opponent #2 has a rating of about 2250. So all things being equal, I'd rather lose to Opponent #2. Opponent #1 is currently winning the game.
However, is it unethical/unsportsmanlike to help Opponent #2 win? Is it considered suiciding or something? Should I just be agnostic about who wins?
Thanks for any guidance.
However, is it unethical/unsportsmanlike to help Opponent #2 win? Is it considered suiciding or something? Should I just be agnostic about who wins?
Thanks for any guidance.