Actually, I know of three that ARE the creeps. They write salacious things on other people's stories, comments, etc, and have their account set up so that you can't respond to the vile diatribe they post. There are people here who have been genuinely attacked by bad guys. But I think the bad guys are now using the tools meant to protect us FROM them, against us. But that's what they do, don't they?
Everyone has own privacy issues
Their effort of complete control of their EP experience. In some ways, they lose out in the long run by blocking all communication because one cannot even send a thank you note for an Asker's pick. Well, to each their own. Moving on...
Because they know you will try to change them!