I live near an inner-city and it’s amazing: the residents will cross against the light, in the middle of the street, with children in tow! When I questioned a friend about this, he said: they think they own the streets and you’re an interloper.
Your observations coincide with mine. In addition the local grocery or Walmart stores frequented by people from poor neighborhoods are dangerous places traffic-wise. Maybe the study should do a demographics study to coincide with the road study.