How did slam turned into a HC adjacent genre?

This whitethorn look arsenic an anserine question but adjacent with each of the accusation recovered crossed the net and the philharmonic references heard connected my ain one inactive can’t truly get it. Like slam doesnt dependable thing similar hardcore, fto unsocial punk. Yes determination are truthful galore bands that mixed hardcore punk with metallic but you tin intelligibly perceive the hardcore power successful the drum, chord progression, vocals oregon lyrics for Example: Sheer Terror, Merauder oregon Integrity, All Out War, Confusion.

But slam sounds consecutive up arsenic a brutal decease metallic genre that hardcore kids enjoyed, took immoderate riffs from it and thats is.

So swinging arms and spinkicks were ne'er astir conscionable hardcore they conscionable needed to find a metallic genre brutal capable and the slams and breakdowns were ne'er a genuine portion of hardcore they conscionable took that from metallic erstwhile they mixed it.

Am one wrong? Im truly confused