> We have had generations of terror threats to and attacks on our railway system, trains, railway stations
I think your take might be based on myth and dramatisation too, as well as a misunderstanding of what the purpose of surveillance is (it's not about protecting children, or trains).
And agree with sibling about Ireland: the Troubles would have been solved by getting the hell out.
I invite you to check how the English government is reacting to independentist movements in Scotland and Ireland post-Brexit if you think they're happy to let people be.