It was self defense

A man on the ground holds a sign declaring that he has Parkinson's. Able-bodied men, who tower over him, angrily mock his disability, Why do these healthy people waste their energy on someone who can obviously do them no harm?

Because they fear him. They see in his stricken body what likely will be their own fate. Sooner or later we are all going to lose the vigor of the young and the steady vitality of middle age. We will be either ruined by advancing years and their inevitable companion disease, or snatched away by sickness or mishap before we are ready. No one gets out of here alive and few get out gracefully.

This man on the ground is a reminder of that. These bullies want no reminder of human frailty, because they share it. They believe that by mocking him they can show how separate they are from him, how strong. But what they are separating themselves from is their own humanity.

Many things distinguish us from the animals. From our capacity (and, as Mark Twain noted, our need) to blush, to our appreciation of music. But nothing comes close to what living together and taking care of each other does to soften the blows of our uncaring Universe and mark us as unique. As a species we excel at taking care of each other. We are so good at taking care of ourselves, we even have time to make other species lives better. Ask your dog.

It is in coming together, in backing up one another, that we find our real strength. Even the bullies agree. Go back and look at the video. It takes a crowd of healthy people to deal with one man cut down by Parkinson's Disease