> without worrying about money fleeing the jurisdiction and we'd be able to fund things like ...

That's a terrible idea. Freedom to leave is a powerful force to keep governments from going too far out of control. North Korea is horrible to its people so it has to lock them in. You're effectively wanting the same thing but for everyone. America has important things to attract value producers so that they'll tolerate paying the tax because they're still better off than trying to earn money in some worse country despite lower taxes. It's up to the government to squeeze as much out of them as it can without losing them.