We all have to draw our own lines in the sand on issues like this and I respect yours, I'd argue on the other hand the open-source nature of Lemmy means the author's politics shouldn't make a difference to groups like BeeHaw which use it. A good example of this would be TOR which was developed by American naval intelligence of all organisations yet many drug dealers routinely gamble their freedom that it will protect them.
Also I'd argue as loathesome as your average tankie is (I really can't stand them at all) they're still a step up from the literal nonces that inhabited early Reddit.