I wholly agree, but I think it would be best if it was applied to the Rights protected by the First Amendment. For example, Freedom of speech should be a given, but even though no fee would come with it, there should be some form of mandatory course required prior to exercising it so that people can speak using correct grammar and elocution, as well as proper use of pronouns and adjectives.
/end DRIPPING SARCASM
That is what people sound like when they call for any "mandatory training" or the like to exercise what should by now be well understood to be a Right.
Should a class of some sort be taken? Yes (in the interest of understanding the firearm mechanism, use, and maintenance; this can now be done on YouTube and the range, but I digress). Should it be REQUIRED? No.