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The other thread had already degenerated into arguing and personal attacks, but I thought it was interesting that no one ever says what I am about to say.
Visible tattoos and piercings and body mods etc etc CAN in fact change people's opinions of you. Don't misconstrue this as me saying I dislike them; I have a variety of tattoos I wish I had, but will not get because of the world we live in.
Currently, if you wanted a white collar job, or a job in a professional field, a general rule is you better be clean-cut. HR departments aside (meaning there is theoretically no discrimination), you still will be judged by your body art, whether you like it or not. So get it if you really want that tattoo or piercing or what have you, but telling yourself that its cool because piercers make a lot of money and you could totally just do that if you couldnt find another job elsewhere is bullshit. Cause in five years you may find out that your life's calling is to be a doctor, and that tattoo is now another obstacle to overcome in your path.