I hope you can see the ridiculousness is saying that corporations should be limited in wealth as well, but even if you can't, let's assume they are limited the same. Now it becomes easier to buy them off, because they are comparably smaller.
The only logical solution is to allow both corporations and individuals to accumulate as much wealth as they are able to. Rich people aren't the problem, corrupt people are. Instead of trying to make rich corrupt people less rich, why don't we try to make them less corrupt instead?
Of course doing something halfway would not accomplish much.
People - maybe. But why corporations? Isn’t that double taxation? The only way money leaves a corporation is through people which will be taxed eventually.
As for the healthcare system, it doesn’t need more money. It needs an extreme regulation and red tape shake up. We could have vastly better healthcare today for the same amount of money that’s already there if not for the bureaucratic mess and an army of administrators tending to it.
Double taxation already happens today.
Even if what you say is true, which I do not grant, your implication is akin to "we should not punish criminals, because some other criminals will rise to take their place." It's a defeatist meme that mainly serves to protect the interests of the already-powerful.
Some work is never done, but that is not a reason to give up on it.