Maria Hill may have been on a power trip, but I'm hoping most SHIELD psychics are more "just get important info we need to save people's lives" rather than "let's find out how his powers work and if he has any loved ones we can threaten."
This is more of an invasion of privacy (that's not even that private) than any kind of mind-rape.
Xavier probably hates probing Crossbones' mind. After all, this is a guy whose childhood hero is the RED SKULL.