There was a very long coroners inquiry on this shooting. In this coroners court the shooters had to explain in details. Yes, they got the identifications wrong, but this was not after some random telephone call, but after four suicide bomber had filled dozens of people.

I think the balance is about right and nothing like the USA. More importantly the jury of peers, in the coroners court, thought the Met Police failed on Health and Safety grounds but not the individual shooters.