...yeah, people aren't going to be reading "insane" on your back. they're gonna be reading "douchebag".
if you don't care what people think, then go for it, man. but it sounds to me like you do. i mean, if it's a "message", if it's supposed to be in-your-face to society... then it sort of matters how people perceive it.
i have a few tattoo ideas. one of a butterfly, on my hip, to cover up my SI-scars -- but not even really to "cover up", but to sort of, i don't know... make it... complete. there's a story behind the butterfly but i don't want to get into it much. it'd probably be very colorful, and the image i have in my head is almost... ethereal, in a way. i can't explain it very well.
i have a couple other ideas but they're not quite as "meaningful". and i do appreciate meaning in a tattoo. i'd only get it if i know i wouldn't regret it.