The problem isn't that corporations are people. If corporations exist, it's difficult to have them not be "people" for the purposes of laws.

The problem is that they exist at all. Nothing in the Constitution says that the government (of Delaware, no less) should have the legitimate power to wave a magic wand and create fictitious legal entities that are effectively immortal but are born without a moral compass.

If it did have that legitimate power, then it's still bad that it can happen for the payment of a $250 fee and filing of a stack of legal paperwork.

Everything that the whiny lefties gripe about with capitalism is actually the fault of corporations, not capitalism. Sounds like you're ok with them existing though, you just think that's possible with them a "little less powerful" or something.