Here's what they have so far.

1 Crabbe and Goyle? Not smart. Not brave. Not schemers. They aren't smart enough for that.

2 Most of the sytherins were loyal to Voldemort, and all had a mean streak in them somewhere (like Pansy Parkinson and Draco). even snape, who everyone thinks is good now, was super mean to harry for no reason but that he was a bitter jerk!!!

3 Slyhterin made all the worst ppl in the series! Voldemorrt, Umbrige, Snape, the Death Eaters, they were all slytherin!!!

4 JK Rowling herself said that she intended for Slytherin to be the EVIL house in the book, and you can't argue with the author no matter what because Rowling wrote the books!!!\

I'm, like, bursting with rebuttles. XD 

Come on, get more points than this! You only have four!!!!!!! 

I disagree. I believe many of the Slytherin are cruel, mean, and weath-focusted, but I belive that many can grow out of that. Like the Malfoys: they help whoever is in power. And lots of the Slytherin would have been killed if they had not joined Voldemort. Evil is too strong a word.