More information is coming out.  You are correct the bomber was born in UK however the parents who are from Libya and there are reports the mother has been out of the UK for a few months and teaches the Quoran.  Get the feeling the parents who ARE immigrants from Libya, had some knowledge of what their son would do, possibly even encourage him to be a 'holy warrior.  If this Muslim family lived in Palestine and murdered 22 Israelis, the Israeli military would have sent a missile into Abed's home killing his family and anyone with them.  I don't think England would do the same but Israel fully understands with fanatical muslim extremisism, it is k ill or be k illed.