You really think such actions as last week's are being ignored? It's on the news 24/7 with 99% of the people in country discussing it within hours. New laws have been introduced in recent years, more money has gone to the security services, 52% of referendum voters giving us a Brexit many of them in response to refugee fears from Syria's civil war, we are bombing ISIS for years in Syria, Iraq and other countries, and more.
Thankfully, the vast majority of British are actually content with their neighbourhood and lives, despite the right wing press trying to have everyone living in fear:
https://blogs.spectator.co.uk/2017/03/many-right-wingers-hate-britain-much/