We can nationalize his assets, which, while not necessarily worth a trillion is not worth nothing. Even if we liquidated his businesses and sold the materials for pennies on the dollar, it would be enough to feed hundreds of millions.
In fact, we can do the same with all the billionaires, investigate them and then hold them accountable for their wrongdoing. One doesn't get to a billion dollars from running a clean business, the way one doesn't buff out like Arnold Schwarzenegger without anabolic steroids.
Musk, after his unethical business practices, has blood of hundreds of thousands on his hands, for which he has suffered no consequences. If justice will not come to him, then pure revenge should.