Can someone explain the appeal of the creepy red-white-and-blue skull thing in America?

This is something I see often here in the USA: people wearing patriotic clothing that has a red, white, and blue skull that looks intimidating and scary. An example of that is here:

https://www.amazon.com/Antrix-Tactical-American-Embroidered-3-54x2-36/dp/B083Y1Y65F

From what I can tell, this sort of thing is popular exclusively amongst the conservative crowd.

What is the appeal or the objective here? American superiority through intimidation? Maybe just a profound obsession with human anatomy? What's the appeal?

On top of that, is there any concern that expressing one's views in an aggressive / seemingly hostile way is perhaps the unhealthiest way in which you could express your views? The creepy / scary skull IS very clearly meant to intimidate and I don't think I could be persuaded otherwise. Even the patch here, with the skull's eyes modified in a way to lower the eyebrows in a more sinister gesture, is clearly meant to create a facial expression of intimidation.