Pune Traffic Police — not same rule applies to everyone

Address:

Pune, Maharashtra, 411021

I accept helmet is for safety. Everyone should wear and now it is compulsory. I forget my helmet at home as was in hurry to office. Police stopped me on mulsi road near chandni chowk. Thats is also fine i accepted my mistake. But at the same time they allowed four others who were not wearing helmet and not even stopped them. When i ask them why she said she dont want to.
Is this the rule which is implemented?
If this is going then frankly speaking india will never get developed country.
Why this discrimination is?
Why rule is not for everyone?
Is this is the way it is going to happen?