I guess it's the same as < why can't I wear jeans to work. Did I suddenly get stupid when I put them on? Some of the smartest people I know would wear shorts and sandals everyday of their life, but they go to work in dress pants, button downs and ties, sometimes jacket. Why? because of other people's perceptions. Why do Doctors where white clinic jackets? perception. Why do hairstylists always have crazy hair
? Why do all sorts of places have all sorts of things in place to set a certain mood or give a certain perception?
Tats in the past have been things that those up to no good usually got. Criminals, gang, bikers, pirates etc. They're associated with drug use, criminal activity and a general attitude of who gives a flying ****. The rest left themselves pretty much unmarked till tramp stamps became popular in the 90's. Then it kind of moved on from there.
Doesn't mean everyone these days with a tattoo is one of the aforementioned types by a long shot, but perceptions still persist. and like I said before, the unwillingness to abide by a dress code would tell me more about a potential employee than a tattoo. I mean it's a tattoo, It's not like anyone is asking you to hack off a leg to help sell prosthetics.