You’re correct on the vast majority of people aren’t violent and unreasonable part… but I very much think you’re missing a point.
Yes, you could mostly always buy something like a part to make a gun fully automatic or a suppressor online. Anybody with the slightest technical skills could make the full auto parts with some metal stock & a dremel. But a lot of people aren’t thinking into it that much when they’re impulsive.
But in the year 2000, you would have to put a bit of effort into finding these things online, and if you were underage it would have been much harder to instantly/easily purchase.
Now wish.com and everything else exist - you can find the parts in seconds, and you have a plethora of ways to easily purchase them underage & shipped to your door in two days.
Yes, the vast majority of these are ATF/Fed or whatever else honeypots… but sometimes that doesn’t really matter if you already have a plan & are ready the day your parts come in.
1000 rounds of 7.62x39 is ~$350. Do minimum wage workers not take in ~$350 weekly anymore?