In the Potter fandom lots of authors take a pro-Slytherin viewpoint - not the majority, but not just isolated eccentrics either. After all, if Harry can repeatedly be wrong about Snape, he can be wrong about the other Slytherins. Also, the notion that a quarter of the school, and of wizarding society, is irredeemably corrupt goes against many people's sense of fair play.
No doubt Draco and his cronies are corrupt - their behaviour proves that even if they're not yet capable of cold-blooded murder - but is every single Slytherin just like Draco? Maybe, but there is room in the canon for Slytherins who aren't, whose ambition is tempered by prudence and respect for the law. (Other canons, such as the transformers, may not allow this leeway for their black hat factions, but the Potterverse definitely does.)
Unfortunately, many authors go overboard, as they do in all fandoms. If they are sufficiently skilled, and avoid ranting, their stories can sometimes still be eminently readable despite their excesses.
No doubt Draco and his cronies are corrupt - their behaviour proves that even if they're not yet capable of cold-blooded murder - but is every single Slytherin just like Draco? Maybe, but there is room in the canon for Slytherins who aren't, whose ambition is tempered by prudence and respect for the law. (Other canons, such as the transformers, may not allow this leeway for their black hat factions, but the Potterverse definitely does.)
Unfortunately, many authors go overboard, as they do in all fandoms. If they are sufficiently skilled, and avoid ranting, their stories can sometimes still be eminently readable despite their excesses.