"We all knows the risks" is never a workable argument for me, because 99% of people don't actually understand statistics, don't understand the systems they're working in, don't understand the mechanics of what they're doing. If people DID understand risk, things like casinos wouldn't operate at all, because they're be unprofitable. How many people on this forum in the past few days have posted "I'm dumb, explain how I can get rich?" and gotten explanations from people who started trading, like, 24 hours beforehand? How many of those people are going to end up holding the bag when - surprise surprise! - the rules changes and the house wins?
People, on average, float somewhere between uninformed and outright stupid. I definitely do, which is why I'm skeptical to the point of paranoid with my money. Protecting people from themselves (and more importantly, from bad actors that can exploit them) is the A1 goal of any regulatory system.