Well, actually, I have multiple disabilities, including CP. Am I selfish, anti-social and cowardly now? But even if I wasn't, I am not paid to risk potential injury like the police are.
I mean no offence to your disabilities; none at all, but there are many ways to help the police. Helping the police is not just the big, heroic stuff such as we saw in the narwhal tusk / fire extinguisher incident a few weeks ago. You can help by coming forward as a witness to a crime; you can stick out your foot to trip up a criminal running away, you can block an escape route with your car.
Ever heard your mates condoning some criminal activity such as drug taking? Don't join in - be unfashionable and tell them what arseholes they are.
Ever been on a busy road and heard the siren in the distance behind you? When this happens, all cars pull over out of the way to let the police through - this is helping the police. I've never seen a car
not move out of the way, and this is one of the only moral, community minded acts you'll see these days.
Simply "not being hostile", or just getting out of the way helps. The police are
our police, paid for by us, doing our bidding and protecting us. I believe that there is no moral law in the universe - morality is made by man. You can make a good, happy society or an unpleasant, hostile one as you so choose.
Finally, one question...what sort of person doesn't like the police?
(Answer: a criminal)