Ratter - //Why would they see it as a tragedy, surely they are happy with his promotion to martyrdom and his place in heaven!? //
For your argument to be valid, you would need to assume that all Muslims are extremists who believe in the concept of martyrdom.
Of course, they don't - extemists are, by definition, a minority - and it is wrong to assume that all followers of that faith are similarly careless of human life, including their own.
A parallele would be to be a Christian, and to have your faith aligned with the Westboro Baptist Church, who fervently preach their believe in God and the bible, but represent nothing that means anything to a Christian believer.
It is possible to be a Muslim and to be saddened and horrified by the words and actions of those who profess to hold your beliefs, even when clearly they don't.