There are plenty of other reasons why firing someone might be a bad idea from an ethical and PR standpoint (like if you solicit political opinions from your emp

There are plenty of other reasons why firing someone might be a bad idea from an ethical and PR standpoint (like if you solicit political opinions from your employees and fire those that you don't agree with). I also don't think it's clear that these employees have engaged in protected behavior. If they're using company resources to organize activism, that's not protected. If they're leaking info to the press, that's also not protected.