An innocent was shot by police on London bridge btw (thankfully not killed). I don't want us to end up like America where police are trigger happy and just claim the person reached for his pocket everytime they kill someone for petty crime.
Not surprising they are "trigger happy" many are pretty jumpy due to the kind of firearm rules they have there - especially those that make a thing of exercising their rights when a simple bit of common sense would de-escalate the situation.