Yeah I dont really see how you can automatically assume someone else is guilty just by friendships and association. Public life is full of photo ops and professional relationships.
Also even us commoners get surprised by things we find out friends and family have done.
That said, Alan Carr having a darker side would absolutely not surprise me.
Alan Carr came off terribly in this interview, where he admits to physically attacking his husband:
"Further, he admits “there have been times” when he questioned his own drinking. There was Palm Springs when he awoke after a night of apple martinis and saw Drayton had the imprint of a flip-flop on his forehead. Carr had gone wild, he learned, attacked Drayton and ransacked their hotel room."
And also 'hilariously' shoves coriander into the mouth of someone who was allergic to it:
"There are six of us in this photo studio, including Carr’s manager, makeup, wardrobe and a publicist from ITV. He picks up the coriander and stuffs it into the mouth of the woman who said she was allergic. “See!” he declares, triumphant. “You’re not really allergic. If you were, you’d be dead by now.” He cackles. Everyone else cackles. It’s like the canned laughter of witches."