It does rather sound as though the security services may have dropped a b0llock

[Sir C]

with this bomber. He was well known to them, he'd been to Libya and Syria, had known links to Al Qaeda and members of his own family had informed on him saying he was dangerous.

But there's probably 3,000 fúckers who fit that description. You can't keep them all under 24 hour surveillance.

You could, I suspect, apply one round at high velocity to the back of each of their heads, but we're apparently not allowed to think such hatecrimes.