You can control them for days, so it's a lot more difficult to undo stuff that was given almost a month ago, you can use cryptocurrency so that it doesn't matter what any court decides it's irreversible. But in general I agree with you that scaring them into giving all of their money voluntarily is more useful, however I don't see any reason why you can't make them give all of their money and also a warning to others, that is a lot more scary because even if you fought in court to get that money back you would immediately donate it all and die, so eventually people would not try to pursue those cases. And the fact that they had to originally leaves a clear public paper trail to track the inheritance, which would otherwise be impossible, so rich people would just hide their wealth.