UK vs US police

I was watching a Netflix documentary about the 7/7 bombings and it was crazy to see that they sent 2 police officers with light armor to apprehend a potential suicide bomber. Maybe I'm wrong but I don't remember ever seeing something like that in the US. It feels the US police would be way more cautious in their approach. Teams like SWAT and bomb squad would probably take some time to deploy so they would just try to contain the threat. Even then they would probably send in a robot/drone first. Not a knock on either style.