Because billionaires who aren’t dead or in danger won’t just let it happen. Also, they aren’t exactly innocent for the state of things - most if not all of them engaged in vast amounts of unethical and often outright illegal behavior to attain their wealth. They have been actively working to make life shittier and deadlier for everyone else, and they deserve some justice for that, if only to discourage the next people who consider imitating them.