Earlier quoted context omitted.
Technically, any occurring "federally illegal" activity is just not successfully policed criminal activity. (States can't actually make something legal the federal government says is not legal. They can just decline to use their own resources to police it.) Generally speaking, most people would consider "not usable in crime" to be a feature rather than a bug. ;)
I don’t think there is as quite widespread consensus that all federal crimes are legitimately crime as you seem to think. Marijuana sales, for example, seem extremely popular. Just because there’s a law in place at some remote level of jurisdiction doesn’t mean it’s just, or has popular support.
Your comment makes no sense at all. For something to be a crime it has to be explicitly defined in law. Consensus has zero to do with it. Either there is a law, or there isn't. The whole point of rule of law is that you don't get to pick and choose which law applies to you in a given day of the week.