Because if there's one thing billionaires should be scared of, it's billions of people suddenly becoming estranged from the economy. Having governments pump money into the consumer demand side becomes a no-brainer once you're faced with deflationary depression and mass unemployment. Your investors then get taxed to give UBI to workers to spend money to keep your sales up. It's probably the one form of wealth redistribution that on balance would actually benefit billionaires.
When you have a surplus of poor people that might insinuate insurgency it's always possible (and cheap) to hire one half to kill the other half. Problem solved.
What else had capital been doing for the last 200 years?! It works when the financing loop is not zero-sum. It only leads to catastrophe when you get too successful and start to blow bubbles or invade other countries.
Why would they worry when we're all content to lay back and die? When was the last time someone murdered a billionaire? It almost never happens. They have no need to worry.
That assumes a degree of forethought and worry about consequences that the current set of billionaires seems to be studiously avoiding - along with half of everyone else, near as I can tell.
Idk. If I were a billionaire I'd be terrified, and not about simply finding a way to save my own skin. It would seem glaringly obvious that things can't go on in a way where 99.99% of people hate you.... I mean, not that you have to give away all your money, but a self-preservation instinct would demand you at least look like you're doing something more than raping the universe.
I don't hate billionaires. They basically never cross my mind. All credit to those guys for doing what they did. I'm not personally jealous and I find the anger and jealousy at them to be petty and kind of stupid in a way that reflects badly on the person expressing it. Most of the billionaires in the tech sector didn't inherit that kind of wealth, and I respect the ones who earned what they earned. I wouldn't trade my life for theirs and I don't feel left out because I don't have private jets or islands. Whining you don't have a jet or an island is childish... grow a garden and get a dog, don't be jealous. Comparing what you have to someone else's possessions is a basic fault that makes a lot of people miserable for no reason, unable to appreciate what they have. Appreciate what you have. Billionaires can have everything you ever dreamed of and still be much more miserable than you. Good for them if they're happy, I say.
I'm just also saying that if I were in their shoes I wouldn't think the current situation was tenable.