It's just part of our generation that wants to so desperately "fit in"
It's funny, when I see a guy with trendy tats like that, I don't really think it's that cool. Rather, I see it as a huge sign of massive insecurity. Where he has to mutilate his own skin to feel like he fits in or tries to "look cool"
And lets be real here, lots of guys do it to try and "look cool"