Pannonian's point is that if we intervene we're evil Imperialists, (Libya) and if we don't intervene we don't care (Syria) and its often the SAME PEOPLE making both arguments.
It is, therefore not possible to "take criticism into account where possible and adopt reasonable courses of action."
There is a well documented trend of second generation immigrants being more extreme and less integrated into British culture than their parents. This manifests not only in Terrorism but in tacit support for Suicide bombing, rejection of liberal Western ideals (such as women not having to cover up) and generally being bad citizens.
The fact is, in the UK only Muslims commit suicide bombings and irrc all the bombers have been born here.
So, if we let in no more Muslim immigrants or refugees they will not go on to have children who become suicide bombers and murder other people's children.
It's not a very compassionate response but it is a completely logical one.
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