edam - you could say 'there but for the Grace of God' referring to being unlucky enough to be caught up in the bombings too - these officers thought they were preventing more tragedy.
How many, genuinely would have run and vaulted a barrier with someone shouting 'stop, armed police in a crowded area in broad daylight? One he's telling you he's the police and two he's TELLING you he's armed!
I also beg to differ - this killing COULD have led to capture of the guilty, it COULD have prevented more slaughter - the intelligence was wrong, but the theory wasn't.
There must be loads of instances of wrong intelligence in war situations where lots of people have been killed as a result, our own men killed by friendly fire - it's tragic, it's sad, but unfortunately it's a fact of life - there will be more instances of wrong intelligence, there will be more officers in the future making the wrong decision, teachers will make mistakes, doctors will make wrong diagnoses - because nobody is perfect, we're all human. Of course there will be inquiries and we will learn from them but mistakes will continue to be made because they're part of our lives - we all make them everyday but fortunately they don't result in tragedies like this.