@pastanaga - That's one of the things that people need to think hard about before they get a "tribal" tattoo. Many traditional tattoo artists will be happy to give people from all cultures some of their tattoo work, but the design has to be negotiated properly.
The Maori, for example, have particular symbols for certain professions and tribes and, while it's fine for an outsider to take a Maori tattoo in general (as long as it's done respectfully), they aren't going to be happy about someone randomly getting a tattoo that announces them as a member of such-and-such tribe, and rightly so.
It isn't great when the average person does this, but it's even worse when someone in the public eye does it. It's essentially the same as stealing someone's intellectual property and then completely misconstruing it, often unintentionally in a racist way. If your hope is to show a love for a particular culture that doesn't happen to be your own, then be careful about how you do it.