Because the gigawealthy have captured politics more completely than probably any other time witnessed by those of us currently alive.

How is that a reason? I think you're using some form of the argument

"Why should I recycle this can if X person has a private jet"

The answer is because they are both wrong but you only have control over one.

Well we are all going to die from climate change anyways. Some extra corona deaths and working economy seem like a win/win If you are a climate doomer.

Because to survive in life you have to contribute to the survival of others. Anything else is selfish.