If you view humanity so dismally you are welcome to never go to space. I would suggest you not be a bucket crab that tries to doom your entire species to extinction out of pathological guilt though.
Billionaires aren't identical. They are human beings, like you or I. Only 3 are currently doing anything related to human spaceflight. That leaves several hundred not doing anything space related.
Is it important that specifically those 3 billionaires stop doing anything space related and divert their funds to, say, humanitarian causes? Can't the hundreds of other billionaires tackle Earthly problems?