I agree with Kronas, and I never do that
It's his choice, I wouldn't care what he though of my tattoos, so why should he care what I think of his?
I don't like the design and I'd never have one there, but the design means something to him and that's the important thing, if when he's 50 he wants it rmeoved I'm sure he'll have a spare grand or 2 to get it removed.
As for people regretting having their tats, then they had them for the worng reason, I have 3, each one was done to remind me of a time, a new start, and one of them even got a bit messed up, but I love them and especially the messed up one as the fact it's messed up makes it more fitting for what it was to remind me of.