we need to pick the side that will do the least harm. There is no way to be neutral with FPTP voting.

I don't think you need to actually "pick a side," in the sense like they're the team you support and root for. Vote for the best candidate available to you, yes; but don't stop complaining about the paltriness of your choice. Don't stop agitating for an end to an ongoing genocide that is being supported by your best-of-two-bad-choices rep.