Seriously, Gates is a 59 year old man who walks with a cane. He's not a wheelchair bound cripple or a 90 year old fragile leaf.
He manages to get to and from work and get around on a college campus on his own every day.
You people are completely ridiculous sometimes.
You see, in some circles there is a thing called "manners." For example, I open doors for women. I open doors for my wife and help her out of the car. I have been known to help seemingly perfectly able bodied yet older men and women when I see they are having some difficulty, be it navigating up or down steps or loading their cars at grocery, hardware, or warehouse type stores. In the picture, it appears as though Professor Gates may have been having some difficulty getting down the steps. Officer Crowley seems to have taken the time to notice and offered some assistance, something I would consider a common courtesy. His "friend," President Obama seems oblivious to the situation, perhaps he's more concerned with the upcoming photo-op.