Sadly there is no reason, other than criminal intent, for the actions of a few morons who caused the horrible events of the last few nights.
It is something that needs dealing with, and quickly!, by Government. I see the police now have authority to use 'baton rounds' .
This may help,along side the vast increase in numbers available, but more importantly it is so good to see the local communities rallying together to clear up the mess left by these sad gits.