Jim, all the mass casualty attacks and attempts were made here in UK and are the only indiscriminate deliberate mass casualty attacks here since WW2 60 years ago.

Your "As there have been against Muslims by Christians and Buddists - Israel has...." is irrelevant to our experience here.

Musket, "what should we do."

We should not allow them to change our system and way of life.
We should not allow them to spread and inculcate hate between our communities.
We should be vigilant and alert.
We should not be complacent and pretend that there is no threat.