Tell an American that something is "required" and they'll feel like doing the opposite, just to let you know where they stand on the issue.

Personally speaking, the spouse and I take extra training every year, year and a half. We know where we are lacking when it comes to our education with firearms; we understand this and e do something about it. We do this because we are adults, and we also recognize the concept of personal responsibility. We also understand the consequences of being the owner of a thing that may cause injury to another if certain standards were to slip. If my eyesight is failing, I am not going to ignore the fact and keep driving a car and hope for the best, and education with firearms is along similar lines.

To have someone that does not understand those concepts suggest that training must be done at specific intervals is not only insulting (intentional or not), but they are subtly removing God-given rights by inferring that I am not responsible enough by my own reckoning. Mandatory training would not only require registration of the firearm, but it would also come with government-approved trainers. I also guarantee that government-approved trainers would come with questionnaires about mental health, emotional health, and a test given at a standardized testing facility, written by people that don't have an understanding of firearms but that do have an understanding of convoluted, governmentese-style questions that require you select the BEST answer out of the four provided...

This is a foot-in-the-door technique. It's very effective because it sounds reasonable, promotes discussion, and makes you look like an ass if you respond in a way that may seem rude. It's why this psychological technique is used by people in sales.

Firearms are more than the sum of their parts, and the opposition realizes this on some level. Guns are not just guns; they are a symbol that is proving to be like Teflon- and the left can't seem to get a grasp of them to remove, desecrate, or otherwise denigrate as they have the American flag and the American dream. Symbols drive them crazy because the more they try to destroy, regulate, attack, render unfashionable, or indoctrinate against, the stronger the symbol becomes. Their attempt at separation and segregation has backfired, as evidenced by the number of backgrounds run on Black Friday. I see any modifiers to the 2nd Amendment, well-meaning or merely phrased to sound well-intentioned, as a means to whittle away little pieces of that right. Our Constitution unifies us in these rights. In this real war against gun owners, we are Kilroy. Our strength comes in maintaining our independence of regulations and 'reasonable' rules. We can govern ourselves.