You sound like a reasonable person who's given up, and I get that. Given everything we see, it may even be the rational choice, but it's not the moral one. It's fine if you want to check out, but that doesn't explain the cheerleading for policy that will make everything worse. It turns you from a bystander to an antagonist.
If this planet is going to end in fire, I have to believe that Good people are going to fight for it, even if we know we can't win because "if nothing we do matters, then all that matters is what we do".