I don't think /r/WSB is representative of the stock market as a whole.
The stock market is just people trading. Some do stupid trades, some do smart trades. To cherry pick some stupid trades and claim it is all a casino is crazy, imo.
Personally, I am a freedom guy - I think people's freedoms should be maximized.
The alternative to "letting the people trade" is to regulate what people invest in. In my country, it gets harder and harder to invest in anything but the government pension, as every other asset class is being destroyed with taxes and risk of socialist pawning. There are also rules. It is just another tentacle of the "nanny state", preventing people from making potentially harmful decisions. But it limits freedom. Especially people on Hacker News (formerly Startup News) should understand. Should people be allowed to do Startups? It's a very risky undertaking which might lose you money.