I'm not particularly concerned about unfair gains made possible by insider knowledge. The economy is large enough, and the set of lawmakers (not to mention leadership-level lawmakers!) small enough, that that the overall effect on anything is going to be negligible.
My concern would be that the "skill" we're seeing isn't with using insider information, but with using their power to alter outcomes to make whatever investments they'd previously chosen become profitable post hoc. If they're causing our regulatory landscape to be change to pad their wallets, that's going to have a much greater effect on our overall system than just being able to make a trade a day earlier than the rest of us.
My concern would be that the "skill" we're seeing isn't with using insider information, but with using their power to alter outcomes to make whatever investments they'd previously chosen become profitable post hoc. If they're causing our regulatory landscape to be change to pad their wallets, that's going to have a much greater effect on our overall system than just being able to make a trade a day earlier than the rest of us.