You can't just shoot people because you don't like the look of them, or they may have taken a wrong turn. The Stockwell Tube incident proved that.
If they
had shot them there would be all sorts of calls about police brutality, overreaction, bad intelligence, and there would have been calls for resignations, etc.
We don't really know the full facts yet, but I'm pretty sure that the police were more aware of what's going on than you seem to believe. I can only hope that as soon as they made it to the tarmac they were under surveillance, and options about how to handle them were being weighed up.
It was probably quickly apparent that the only danger they posed was to themselves.
As far as I am aware, nobody has ever tried to blow up a plane on the ground.
The armed police are usually there to stop terrorists boarding planes about to take off, or causing mayhem in the terminal buildings themselves.
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