TheHoneyBadger can you ask yourself why you expect muslims to do it?
Because of the way Muslim society is organised, based on the teachings and pronouncements of religious leaders being given great authority, yes, I would expect to see a few demonstrations of this publicly at least. Since the agreement of the people is seen by some as a legal legitimisation in Sharia equivalent to law, then its actually even more important than in countries where we have a clear separation of government, legislature and judiciary.
These are ongoing mass murders, done to attract publicity for a political cause, not one-off, unrelated acts by individuals acting alone. So, yes, I would have expected to see Muslim religious leaders leading large scale public protests against them, as was shown to be clearly possible by the anti-Charlie Hebdo demonstration, which was in my opinion, in very poor taste. Particularly when Muslims from this country are being radicalised and encouraged to fight abroad for IS.
but is every christian in england expected to march when some fundamentalist christian group in america does something? I don't expect every Muslim to do it. I would have expected to see some Muslim religious leaders leading large scale condemnations of the murders, yes.