As said in the title why do you guys hate them so much? They're totally justified in their request. If Heinrich Himmler (Hitler's lieutenant and leader of the SS) decided to change sides and sit at the top of a mountain with a bunch of old men, would you say he should be totally forgiven of his past crimes? Plus they were like total bros in Morrowind and Oblivion, you're just making caius cosades sad.

Because they are arrogant. Their attitude is pretty much YOU WILL TAKE OUR SIDE! I choose my own way in Tamriel so the Blades can go hang.

Delphine

But why is that bad? Is that not the same as every other quest giver?

The Blades are just much too awesome for most of these people and so they act out in jealousy.

It is known.

What "crimes" are you referring to?

Because they try to force discretion upon the Dragonborn. They are supposed to follow the Dragonborn. Beth screwed the pooch and wrote a stupid story.

Delphine wants us to kill Parthurnaax.

This is not the place to talk about nazis.