Generally, I don't side with people who leap up and down screaming that jokes are "offensive".
The people to whom the joke is supposedly offensive would not, generally, give a hoot. The only people who are "offended" are the objectors who, on the whole, are just trying to claim some ludicrous moral high ground.
As an example ... when Jimmy Carr made his joke about the injured soldiers, and we should have a great team for the paralympics, he was almost lynched ... but it turned out that the soldiers themselves thought it was funny.
So, against the background of me not being easily offended by "close to the knuckle" jokes, I did think that FB's jokes about Harvey Price were badly judges, and FB made a big mistake.
It was the one about whoever loses the custody battle has to keep him. I can't imagine how little Harvey would feel if he heard that (which he will, now that it's been given so much subsequent publicity by the objectors).
So there we are ... poor judgment ... and yes, FB and Channel 4 should agree that they made a mistake, and should apologise.