It’s shitty, but you will get one of them in power, and it’s encumbent on you to vote for the obvious lesser of two evils.

If you like the Greens (or whoever else’s) policies, work to fight for them the other 1,458 days of the election cycle - polling day is for buying a few more years of moribund US democracy - not for pissing away your vote and letting the fascists in.