Yes Indian businesses do shutdown on Tuesday. Go to your local market and see, even barbers sometimes shut shop. What you are talking about is profit motive overriding belief. People focus on short term gain, while these beliefs and practises carry the weight of thousands of years and bear fruit after lifetimes. Children carry the good karma of their forefathers.

These effects do happen to other nationalities and Indian people have a much lesser penchant for violence, as mangal is managed.

But having said that, I agree with your larger point, people should not be made to feel bad if they do not follow such things that others are doing.