That's already a long introduction, and I didn't want to extend it by discussing the issue of how the Commerce Clause is used by SCOTUS to justify arbitrary dec

That's already a long introduction, and I didn't want to extend it by discussing the issue of how the Commerce Clause is used by SCOTUS to justify arbitrary decisions. Enumerating the things which should (and shouldn't) be protected by that clause, and then narrowing its scope, is also a worthy goal, and could be done at the same time, I think.