Becoming an hero means to commit suicide.
I think it's the cat playing with words, what with An Hero's relationship to "a hero" and 4chan. Sure, kinda tasteless, and for people that lurk/are active posters in 4chan will know that it means committing suicide, and will read the title as "Dying girl taunted by vengeful neighbors, 4chan commits suicide", while everyone else oblivious of what "An Hero" is will just think it's a typo. Should the cat have made the play on words, no, but it's the cat, he tries to draw people in to his threads as much as he can, and by throwing around /b/ slang, he could get a few more views.
But this is a sad thing, where grown adults are bullying a dying 7 year old girl because they texted the girl's parents during a birthday party for kids, meaning that they aren't paying attention/too busy to read a text message. I bet there wouldn't have been a problem if these people just walked over to the party and asked if their kids can join in. But really, why would any sane person bully a dying girl because their kids couldn't go to a birthday party because of their laziness? I'm really questioning if humanity will get past 2012, not from natural disasters or anything like that, but from complete moral degradation, and everyone just reverts into war hungry savages and kill everyone they can before they get killed.
what
http://knowyourmeme.com/memes/an-hero