You can't tar every Muslim with the same brush.
People have been finding religious and political excuses and motivations to live out their hatred for centuries, but the individual should never be representative of anyone else just because the two have read the same book.
People in Northern Ireland, where I live, have been finding the same reasons to kill each other for years now. There are conflict zones all over the world with the same issues with religion and politics. The Ku Klux Klan have professed Christian beliefs in the past, does that make me the same as them? The Shankhill Butchers like to call themselves 'Protestants'. Does that mean I'm the same as them?
When we hear about acts of violence that are supposedly done out of Christian faith, we say 'The people who did those things aren't Christian'. And that's exactly the same reaction your typical meek, sane Muslim has at these kind of atrocities.
The Muslims I have seen have condemned these acts and are just as appalled as others. They are human beings, who feel for this family, yet they are being attacked as citizens of this country, as people the same as whom that soldier thought he was protecting out there in the desert. Show him some respect in that at least and promote the peace he fought for.