I’m not downplaying anything. All jokes aside, and with all due respect to your family history, my grandfather shot and possibly stabbed some people wearing it to death in the Ardenne Forest, so I get it.
HOWEVER- it seems borderline absurd to compare it to the swastika. The totenkopf was and is historic German military insignia going back to the 19th century and on top of that it’s just not very well known. The swastika, on the other hand, is immediately and universally understood to be Nazi insignia because it was specifically adopted by the Nazis, which is why despite 7000 years of humans using it all over the world, most of them from Kipling to the Navajo to the American Girl Scouts stopped using it.
There are some notable exceptions. The Finns have an ancient historic connection and still use it in military contexts occasionally. It’s also used extensively in religious imagery by Hindus. If Ro Khanna has a depiction of Ganesh in his home that features the Swastika, should he resign?
Look, I’m not arguing that Platner should be proud of a trashy tattoo. But it is highly unlikely that most Americans would look at that image and recognize it as Nazi imagery.