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The idea that offence is to be determined by the victim is an appalling idea. It is intended, and when put into practice it achieves, the subversion of the proper bonds of society. We are not to be subject to the rule of offence, but to the rule of law. The rule of offence is ONLY used to support the supposed rights of those who wish harm to British society. As Zoxasi describes, it is never used to defend the rights of Christians and British people against offence.
What you seem to be suggesting, though I am sure you do not hold the view, is that it is not permissible to deny an Imam the right to preach hatred and violence because such a denial is itself violence. This is not a view British people accept. Indeed it is socially insane. In which society does any person have the right to incite and organise violence against others
I think that the isolation of the US from the European experience and history leads to such views as you describe. But they are truly dangerous. I reject them, and most British people reject them.
In a democratic society all people have the right to persuade by peaceful means. No one at all has the right to use violence. It is rather a matter of concern that you seem to think that it is not permissible to act against violence and those who organise violence.