We know, but sadly when you discuss the current bands known as emo, emo is really the only way to describe their genre, even though most "emo" out right now isn't REALLY emo.
Emo is also different than nu-metal is that it's used as a description and it annoys me. People use emo as a negative term. I've heard people who don't like Linkin Park's new album say "they're like a fuckin' emo band now". It just doesn't make any sense.
I wish the term would die already.