What does this have to do with anything? Also that's incorrect: "business end" means on the receiving end, so if the Nazis were using the Sturmgewehr, they're not on the business end. Also the AR-15/M16 series are absolutely still Assault Rifles, as while 5.56×45mm is smaller than the 7.62×39mm or 7.92×33mm it's still considered an intermediate rifle cartridge. The "intermediate cartridge" is literally what makes an AK-47 or M16 an Assault Rifle. The FAL and M14 weren't considered Assault Rifles despite also being select fire because they're chambered in the more powerful 7.62×51mm NATO cartridge, and the new 6.8×51mm is much closer to that than the 5.56. Because of all that most countries didn't "trend away from them in the 70s.", The 7.62×39 AK platform was (and still is) probably the most widespread, but the Western-aligned armies usually had FALs (not an assault rifle) and didn't swap over until 5.56 became more prevalent. NATO adopted it as a cartrige in 1977, but most countries stuck with 7.62×51 for at least another decade. TL;DR: many errors in your comment

Ii mean the reasoning is dumb, but on a side note O hate the "Assault Rifle" discourse. It's gross to argue semantics in regards to a shooting, and recently right-wingers have increasingly started pretending that "Assault Rifle" is a made-up term or something (it isn't) while simultaneously accusing gun control supporters of not understanding proper terminology.