I can only assume you’re being downvoted because folks are thinking that you can’t go supersonic without making a boom. While this may be true, it doesn’t chang

I can only assume you’re being downvoted because folks are thinking that you can’t go supersonic without making a boom. While this may be true, it doesn’t change the fact that you make a good point - regulation should be made as close to externalities as possible. If it makes the upstream thing impossible, then fine, but let’s actually regulate what we want to regulate.