Entirely predictable. If 'they' continue to do it to 'us' it is/was inevitable that someone, probably on the fringes of our society is going to have a pop back. Especially when it's been shown how easy it can be.
It'll be worse when someone realises that diddy towns like Stirling or Plymouth or somewhere might not have the same resources at close quarters. At all the recent events in London and Manchester the riot squads, medics, fire etc have been on the scene in single digit minutes. London has 3000 armed police. How many do we think Inverness has within 2 hrs drive?