Be honest, have you ever shead a tear because of a comic? I don't find it any different from being moved by a book or a movie or even a cartoon (watch the Futurama episode about Fry's dog and if you don't cry, you're not human. Seriously.)
The ending to Y: The Last Man had me in tears. Not the last few pages but about the last 1/2 of the book from the point when
Garth Ennis' War Stories collection has a story named "D-day dodgers". I read it at work and had to excuse myself. Incredible. I still remember the line "with wine on your lips and tears in your eyes".
So?