original work
In the series of Harry Potter novels, J.K. Rowling seems to describe the wizard from Slytherin as incompatible with other upright wizards: at Hogwarts, Slytherin is always pretentious and arrogant; Strive for victory by hook or by crook and do your best; Derogating the other three colleges is also disliked by the other three colleges.
But at the end of the seventh book, nineteen years later, Harry told his son that evil is a wizard, not a college. He felt that even if his son Albus Severus Potter got into Slytherin, there would be no problem.
People are always willing to generalize and make a face of the four colleges-Gryffindor, Slytherin, Ravenclaw, and Hufflepuff. But in fact, Gryffindor has peter pettigrew and Dumbledore, and Slytherin has Voldemort and Snape.
Slytherin is not evil. Like the other three colleges, it's just a group of children. Just because of the different education, these children are more likely to grow up to be unscrupulous people.
Many evil characters come from Slytherin, which is related to Slytherin's pursuit of fame and fortune by hook or by crook. Slytherin is used to being rational and abandoning emotional impulses, so the word hero always seems to have nothing to do with them. But Slytherin and Ray Guller Black and severus snape.