What the hell?

I don't know what's going on some people's minds! You have no idea what happened... someone just sent an e-mail for my whole class, saying terrible things about some of my mates(a major part of them my friends)... that person sent from an account that belongs to the whole class and used the name of a girl that doesn't have too much problems with the class, as some of us have.
Why people don't respect each other? There are exceptions, rude girls and boys that doesn't deserve any consideration... but good persons? I don't know why, seriously!