Not all skinheads, amiright?
It’s imprtant to note that this was in the late ‘90s. There was basically none of the tattoo culture that is so pervasive today. People who wore this type of tattoo were nearly 100% associated with some form of extremist ideology. Sure, some of them were punk/straightedge something-or-other, but you sure as hell didn’t see the average 20 yo kid with, say, an iron cross tattoo. The SPLC keeps this list not to say that everyone who sports this type of marking is a white supremacist, but that these designs are historically so heavily associated with hate groups as to be a major indicator of affiliation. Same as Pepe the Frog and red shoelaces. Tattoo culture has changed dramatically in the past 20 years, but the original usage being diluted doesn’t erase the predominant intent.