A tattoo is an outward sign of an inner defect.
It used to be that a person with a tattoo was someone who didn't conform to trends or fads. They were different.
Nowadays, tattoo'd people all look alike, all follow the same trend and fad, i.e., lets look like jailed inmates and felons.
Also, let's narrow the pool of potential friends, associates, work, etc by getting inked. Getting hepatitis is also fun.