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We were talking specifically about terrorism in the UK, not murders in the USA.

USA should ban private gun ownership, obviously. This would do a lot for their murder rate, it would do a lot for their "people killed by toddlers" rate, and it would be a lot cheaper and less invasive than ISPs logging 300M internet access records for a year.

Prioritize things which have high impact, are easy to address, and have specific good outcomes. Not "anti terror" metrics which are vague, difficult and expensive to address, and have extremely low impact.

TSA isn't a good system. And it doesn't become a good system just because 'we have to do something about some crimes'. Sure. Do something better, and do it about more important problems.