I really don't see how you can use a human concept - excuse - on an animal. They have no thought process like that, "Oh I just need to find an excuse to bite." I can only assume you mean people are making excuses FOR the dogs that bite. However, I don't think people here are doing that either. They are only discussing some of the reasons/triggers that may not be apparent to us that have caused some dogs to react by biting.

Thought of an example: If I'm with a dog, and I decide to take a toy from him, and he bites me, the REASON he bit is because I took his toy. That doesn't make it okay, and in fact would mean that dog would need a serious NILIF program and obedience training or consult with a behaviorist. Reason does not equal excuse.. reason is just the trigger.