I support free speech for people I disagree with why would I not support their rights under contract and copyright law? I guess given your post I would ask should we not support the protection of rights for those we disagree with?
Obviously because your making a false assumption on their behalf that using copyright for copyLEFT is already an established right. But it’s not, this is according to reports actually the first case where Stallman’s license is being tested by a US court, so I don’t assume the leftists are going to win, nor do I claim they have rights which don’t exist yet. Being generally opposed to leftists, I hope they get creamed. My right.