The trouble is that people who quite rightly are nauseated at the notion of placing a bomb in a place where it will kill innocent people will find ways to excuse and justify precisely the same kind of thing when it is done by people acting on their behalf in a way that isn't directly visible to them. It becomes 'a sad necessity', in a higher cause.

I refute that assertion.
It goes without saying that ordinary, decent Muslim people abhor this crime as much as all other ordinary decent people, even though it was done "on their behalf."

Only fanatical extremists excuse or justify such acts.

I think you should excuse and justify that assertion, with examples, or withdraw it.