One could but one shouldn't because it goes into very dangerous territory because then you have to define what is a "person" in quite specific and concrete terms than would exclude quite a few people and quite a few groups.
A few lurking around GD would be excluded for a start, as I guess some form of intelligence might be a requisite.
What the hell is wrong with you? The guy beheaded a soldier in public... and you want to protect him? You obviously aren't British
What on earth are you going on about, it's got nothing to do with protecting the accused, the prison guards are there to do a job, and in that remit there is no mention of them being judge & jury and meeting out whatever punishment to 'bad' people they feel like.
So if they have broken any rules then they should be suitably punished.
As much as the devolved denizens around here like to bay for blood, I for one am glad we don't have capital punishment and a system that at least tries to watch the watchers to stop abuses of power.
And if you want to change that, then go out and vote for the party who wants to bring in the death penalty and carte blanche for all police, prison warders etc to be able to beat up whoever they like whenever they like...or is that just the people you don't like? Hmm, not sure how we would word that one...
As a side note, I don't think they actually did behead him did they? If you look back at what was reported, it came from some eyewitnesses saying ' it looked like they tried to behead him', which I suppose when you are flailing machetes around, loping off extremities is an easy side effect. The point I suppose is that to me it is irrelevant, they stabbed him to death in the middle of the street and should be prosecuted to full extent of the law (and no, that thankfully doesn't include beatings, torture or execution) it's just the media can easily whip people up into a bigger frenzy by playing the muslim/soldier card and juicing up the details.
I wonder how many more people have been stabbed to death in London alone since this event, that hardly makes the national news.
edit: too slow...answered above already