The chief coroner of England and Wales, Mark Lucraft, concluded the London Bridge victims were unlawfully killed. In doing so he refused to criticise MI5, the police and the other emergency services.
How right he is.
Yes, the barriers should have been better, yes, things could have been done differently, and yes, 20:20 hindsight is useful.... for the future.
But the emergency services, the individuals at the scene, were working with what they had at the time, and they did their level best to make sure matters were not worse. They deserve our thanks and praise.