Basically, to some extent, Channel 4 are using Big Brother to show the channel's support for social equality. Nothing wrong with that btw. But they are frightened to death of mad Politically Correct views.
For example: someone speaks out about the lack of disabled housemates, so Big Brother bosses panic and purposely look for someone with a disability who would appear popular. They found Pete. I've Nothing against him, i thought he was fantastic and deserved to win but don't you think this was all part of the agenda.