This is a suitable message to the rioting students (and others) involved in the protests in recent weeks. They are about to learn the law of cause-and-effect.
As Guido has picked up (I honestly hadn't even thought to look for this myself) yesterday's poll by Angus Reid shows that Britons are "saddened, ashamed and disgusted" by the student demonstrations, and a substantial majority of those polled would be in favour of the introduction of water cannon to deal with the violence that usually accompanies those events. They also favour the so-called "kettling" technique by police.
Whether or not introducing water cannon would necessarily be the right way to go - and there are con's as well as pro's - something certainly needs to be done to protect bystanders and others, and property. It is only the behaviour at the protests so far that has produced this poll result; and it demonstrates very clearly that the students now have little public support.
Whose fault is that? It's a no-brainer, isn't it.
Cause and effect - QED!