Slytherin House

[wittchway]

No: HPFGUIDX 46930


THis was recently pointed out to me by a friend who had seen the 
movie but not read the books. And really I couldn't answer.
 
The question was why keep Slytherin house around? Couldn't the school 
work just as well with three houses? Wouldn't the sorting hat pull 
other strengths the students had and place them appropriatly? 

Supposedly the schools been around for a 1000yrs and the four 
founders had aparting of the way with Slytherin then. Why didn't they 
just drop him then and his name from the school?

Just wondering.

Thanks
Wittchway