I work as a bouncer, literally everyone I work with has tattoos. One of my mates is covered in nazi tattoos, swastikas, the iron cross, SS, 1488.
Honestly it's all bullshit, the only reason criminals, soldiers, prisoners etc get tattoos is to scare the fuck out of normal people. It's part of the image, muscles, bald head, beard, tattoos, scars. It's all designed to intimidate people. It doesn't actually mean anything it's all just war paint. It's only these nu-males and SJW whores who put "meaning" behind it.