Change of Ideals
Just because you love Judy forever today, you might one day say "Lordy, lordy, Judy's forty," and move on to someone else. Just because you're an anarchist today, or a proud Texan, or straightedge, or a pothead, doesn't mean you will be forever, so give serious thought to whether you really want a tattoo with political or social implications.
It's very easy to change your mind. It's not so easy to change your tattoo.