It is criminal behaviour. It reinforces to clients that the attack is not legal, and that they are not to be tolerated. (and as a message to the DDOSer - they'

It is criminal behaviour. It reinforces to clients that the attack is not legal, and that they are not to be tolerated. (and as a message to the DDOSer - they're likely to be reading this too and reminding them it is criminal and law enforcement is involved might make them reconsider the attack)