I'm a little confused by your comment.

Insider trading is already illegal (this case proves it). If the problem is under-enforcement, then I agree that better enforcement is the fix.

Banning gambling is a completely separate intervention addressing a different activity, and clearly wasn't required to bring charges in this case.

The tendency of governments to create new laws instead of enforcing existing ones is how we end up with absurdly complex legal systems and the loopholes that come with them.

I think OP's point is that gambling creates so many additional incentives that it overloads the system and we can restore it by just banning gambling.

Personally I think the system shouldn't be so easily overloaded.