What's a "hero"?

Maybe it's just me, but...that guy who got beheaded on the bus in Canada? People are calling him a "hero":

McLean called hero

Beheading victim Tim McLean's final actions helped save the lives of fellow passengers aboard a Greyhound bus last month, says one witness to the tragedy.

[...]

"If it wasn't for what he did, there would have been more that didn't get off that bus," said the 19-year-old Northwest Territories native.

Oh, bullshit. He wasn't a hero. He was, quite naturally and ultimately unsuccessfully, fighting for his life.

You know what would have been heroic? For the rest of the passengers to pig-pile on the guy with the knife and STOP HIM!

What if a guy starts killing another guy on a moving plane or train? Are you all going to throw the doors open and jump out, or are you going to STOP THE MAN?

Yes, the first couple of people to jum on him would have been at risk of coming into contact with the knife blade and being injured as well. That risk is what makes things heroic.