This isn't about DPoS. It's simply not illegal or criminal to patch a f/oss p2p app running on your own machine, which is what the witnesses did. This ain't a bank account, it's a blockchain: it's a game where everything's made up and the points don't matter.

Nobody "froze" an account, because there are no accounts and nothing to steal.

Cryptocurrency tokens aren't assets. They're not property. You can't own them. You can have knowledge of a key, and you can publish transactions derived from it. They're speech, not property.

Freedom of association means that nobody has to listen to your speech if they don't like what you're saying. This includes your transactions, and applies to block producers.