Your right Mark, some people are convinced that peregrines nail game birds. Of the 3/4 nest sites that I watch, I have never seen them come back with game birds, they do pigeons and blackbirds.
Not all keepers are bad, the majority are good people, but like any other trade, the good ones go un-noticed whilst the bad make the news.
Like I said before, the estate managers and owners should be held culpable for what happens on their land, until that is law, then i`m afraid it will never stop.
Edit t add...........I, for one, will stand up to these people, and do so, it does me no favours, but that is my belief and my standing on the subject. .