When you believe that what others do is none of your business, remember this 7adeeth:
One's responsibility in his society is like a village that took their places on a ship, so that some where on the deck, and some where below deck.
When ever the group below deck wanted water, they had to ask the ones on top of them. Then they thought to themselves, why not make a hole in the ship, so we do not bother the other group, and get our water.
Now, if the group above deck allow them, they will all perish. But, if they stop them, they will survive, all of them.