It's not just the UK. The US, China, Russia, EU, New Zealand, Australia, Saudi Arabia, Israel, etc.
The first thing you see after a terrorism incident is a controlled government+media propaganda campaign. They all use the same mindless talking points.
The second thing the government+media does is advocate for stealing your rights and more surveillance.
Someone does something bad, everyone else gets punished. It's true of "free" societies or authoritarian societies. Same tactics. Same terminologies. It's for our benefit and it's to keep us safe. Big brother loves us after all and knows best.