A lost child was crying at Punggol but dozens of people just kept walking past him

Dear TRS, 

Today I went on my daily cycle routes in the evening at Punggol Waterway.

As I just  began cycling, from a distance I saw a number of passerby's staring at a kid and as they passed by him they looked back and stared at him again and continued walking away. As I approached this young boy probably 9 or 10years old , I looked at him and noticed he was crying alot so I quickly stopped and asked him what was wrong, I knew he was lost and I quickly handed him my phone and told him to call his mum. He was crying so much that he could hardly explain that he was lost. Immediately an Indian man nearby ran towards us and started cheering up the boy, telling him we'll find your parents and not to worry.

Unfortunately the boy didn't know his parents number or his exact address. I left the boy with the man and quickly cycled to the last place where he was with his family, and that's where I identified the mother. As I brought the boys family towards him , it really made me smile when he ran 100meters and his whole family gave him a tight hug.

Now the reason why I'm writing you is not to show off the deed I've done today. What really has been on my mind is why where there so many people walking past him who never bothered to ask what was wrong. There were a group of ladies, definitely mothers who stared at the child and just walked away. I remember getting lost at the Zoo, even in Mumbai when I went for a holiday. I know how painful it is to be separated from your family especially when you are in an unknown location. 

I simply cannot understand why people walked past a child who was crying so loudly. Mothers walked past him, where is their motherly instinct? Cyclists and runners went past him, why didn't they stop? Why have Singaporeans lost their heart?