If you are living in a country, then you should obey the local laws. Cow slaughter is illegal in India, and despite that members of the minority community perform it and trade with raw beef. If you don't obey the laws, then you have only yourself to blame.
I agree, it is illegal, but it's also illegal to murder someone like those "cow saviors" are threatening to do. I suspect that even in India a human life has greater value than that of a cow.
The punishment for doing something illegal is a fine or a jail, not being slaughtered by angry mob, which can happen in third world countries ruled by savages. We'll just have to wait until those crazy people kill someone for eating a burger and see what the government does about it.