<< IMHO, it boils down to simple and blind intolerance on the part of the radicals.
No matter who you are, what religion you may or may not practice, if it is not Islam, then you are an Infidel and should die.
And to suggest that a non-Muslim merely being on a piece of ground that is supposedly Holy is blasphemous is just another example of their intolerance.
It's ludicrous, prejudiced, and a slew of other unflattering descriptives, with no clear end/solution in sight ... >>
These people are just doing what their God has commanded them to do.