There is no such thing as a Muslim community, we live in a country that doesnt pigeon hole people and stick them in ghettos according to their religion, there are probably a few million Muslims in this country, with different backgrounds, different languages, different cultures, different ethnicity, different religious beliefs and sects, they have as little in common with each other as they do with any other group. There would have been Muslims in the crowd yesterday, Muslims working at the venue, Muslims working in security. None of them belong to a community, its just the religion of their birth. They dont speak in one voice, nor live in one area, nor have one way of life.
Saying all that, there a lot of Muslims blowing themselves up around the world, even a handful is too many, something absolutely needs to be done, but asking some fictional community to appologise is a waste of time and wont deter any would be bombers. If these guys are prepared to blow themselves up and kill kids, I imagine they have utter disdain for anyone in their "community".
We need to give the security services more resources, I always hear that the police cant monitor everyone on their watch list because they dont have the resources, lets give them the fucking resources, this is a far more worthy matter than the £40billion we are spending on a fantasy nuclear threat.