No, you specifically said it's a first amendment problem and to let adults gamble. If it was a first amendment problem, gambling wouldn't be illegal in most states.
Maybe you need explicit help to understand my position. If hedge funds can short/long stocks, there should be nothing preventing a retail investor from doing the same.
As for it being speech, well, corporations are people and PAC/SuperPAC political donations (read: blackbox donations) are speech. These are current USA facts.
From there, I extrapolate that it would be unfair to regulate Main Street instead of Wall Street. This wouldn't be such a massive problem if Wall Street wasn't allowed so much leverage (and short 140% of the company shares...how is that even legal. That's literally fraud). I can't sell you 100% of my property and then sell 40% to someone else.
It's that simple, stop obstructing discourse.