Snape, Slughorn, and Draco are all terrible examples. Slughorn is a manipulative jerk who uses students as tools. Snape was a death eater who only switched sides when Voldemort murdered someone who he personally cared about. Draco was a terrible bully, who tried to commit murder before realizing that he wasn’t quite evil enough to do that.

Of course , they are not “bad”. They’re chosen to become Slytherin because cunning and ambitious:)

Considering that Snape is slytherin not all slytherins are bad Draco is Slytherin and he's not bad

Bad slytherins are bad. Salazar was bad

Salazar was probably pretty evil. He put a freaking Basilisk in a school. But that doesn’t make all Slytherins evil!

That’s like blaming children for the sins of a parent

They're not bad

Well, 50/50

Some turn out good like lets lestrange

There are good Slytherins.

Yes there is good Slytherin