The people in the temple were going about their lawful business. Plus claiming to be the rightful King of the Jews was insurrection. He kinda brought it on himself.
Discussion
the billionaires have their money all legal. a lot of legal things are not right.
I doubt anyone ever became a billionaire from trading shekels for lambs. Interestingly, in John, the incident takes place at the start of his ministry long before he was executed.
the purpose is the same, the use of anything is only for personal reasons. That was one of the reasons. The whole moral of the fable was that, people mock, despise, ignore and try to kill what is right.