The problem is that meaningfully helping others often requires self-sacrifice. Solidarity is a shift in perspective, to extend the self around others and act in the collective interest.

It’s not exactly uncommon for systems set up to oppose something to end up supporting them instead. See the ADL covering for Elon and condemning those opposed to genocide as antisemitic. In theory the ADL should be opposed to fascism, but because Israel has become fascist they found themselves on the same side as those who had been and would be their oppressors.