I used to think this way, but I no longer feel the signal to noise ratio provides meaningful data, in particular because people do rash or unreasoned things and develop odd habits (that they later grow out of) in their 20s. That part of your adult life is about learning, after all. (I also don’t believe there isn’t anything intrinsically wrong with tattoos.)

Moreover, having a tattoo isn’t necessarily a measure of low impulse control. I have friends who have ruminated for years about a certain tattoo. Plus, imputing bad decision making to having a tattoo is more a (cultural) projection on your part than anything else.