Where's the compassion?

I moved to Chestnut Hill almost four years ago and in that time have come to love the community for its beauty, charm and amenities. However today, for the first time, I felt ashamed to be a part of this community. 
It should be noted that I am a 57-year old white woman.
As I went out to dig out my car, there was a family of three whose own car was stuck in the ice and slush. My next door neighbor and myself were the only people who made any effort to help this family who were quite obviously in need. My neighbor tried pushing their car with his own without success and eventually had to  leave. The driver of the stuck car was making a little success now and then, but then the car (which was a lightweight front wheel drive) kept slipping back into the slush over and over.
With me and the son pushing from behind, one adult pushing from the side and one adult at the wheel, we struggled for almost an hour. Meanwhile, there were two adult men on the street digging out their own cars who made no effort to help. In fact, at one point when a motorist asked one of these men what was going on, he only swore at them and told them to mind their own business!
While we were working to extricate the car, at least two dozen other cars, most of them large, 4-wheel drive SUV's, crept past us without acknowledging the need. Not one person stopped or asked if they could help.
At first I thought the problem might be racial, as the owners of the car were African American. Then I thought it might be pure snobbery, as the car was an older, cheaper one. Then I realized that there I was, a white, older woman wearing a nice down coat, struggling to help these folks and still not one person even inquired. This problem went beyond racism. At one point the woman in the family remarked, "All these people going by and no one wants to help us out?" Finally, after almost an hour, a couple who were passing by stopped and helped and together we were able to free the car. The family was extremely grateful and we were glad to see them able to go on their way.
It should be noted that the people who stopped to help were younger than me, obviously not from the U.S. originally, as they had distinct North European accents, and did not appear to be from the affluent Chestnut Hill neighborhood, although of course it is possible.
So my take on it is this:  Every single driver that passed us by as well as the two men out on the street could see that this family was in distress. They could see that the only person trying to help was a middle aged white woman. And yet not one single offer of help for an hour - and that was after I came outside and found them. I don't know how long they had been struggling before then. 
So where was the neighborliness, the sense of community, the compassion for another human being in need? The kind of problem they were dealing with could have happened to any one of us. I always thought that in times of trial , people tended to pull together. I believed that during rough times humanity reaches out to support one another. That's how I was raised. Whether the reasons were racist, elitist, or just pure selfishness, I became embarrassed by my community today, and the lack of concern and compassion that was demonstrated by today's events.