Comment about "asking for food in NY"

The video was about three guys that are asking the people one by one if they can give them some food. One person responded that he works hard to get it. And other guy responded "no" rudely.
Twenty minutes later, two of the guys that were asking for food, gave to a homeless man a pizza. Then the last guy of the group tells to the homeless man if he can give him pizza. The homeless man gave the guy a pizza. Then the guy tells to the homeless man that he got to go, he say thank you and gave the homeless man money. The homeless started to cry.
The video had an impact on me because how can a man who has nothing share the only thing he got when the people who has everything they need doesn't even want to share or help the others?