Actually whenever the price of money is not artificially controlled you will find the worst of loan sharking, violent swings in the business cycle, bank panics, economic crashes, manias, and all other manner of evil. Artificially controlling the price does not automatically eliminate all of this, of course, it just makes it dramatically fantastically more likely that such chicanery does not happen, or happens less frequently, or happens less violently.
It doesn’t take a lot to compare the 19th century, when there was none, with the 20th, when there was a fair amount.
But it all depends on the wisdom of those holding the reins - just like running a country, running a corporation, or riding a horse.If you have a fool at the controls expect very bad results. If you have no one at the controls, history tells us that it’s worse than having a fool in charge of it.