Think about this, you make fun of someone over the internet and you get particularly flamable, then the next year that someones army invades and a group of soldiers threatens to rape your daughter, you ask for mercy but they show you your history and you wish horrible things to them and their family.

is there a moral incentive not to offend anyone ever because it may be the cause of someone taking it out on someone you know and you will never be 100% guaranteed to be able to protect them?