This is in context with India particularly. Parents always think they are the parents and they have the right to control their kids life. More you impose more you want to let free. However, parents have to respect the fact that when kids grow up they become adult they are not kids any more and you cannot impose on them as they think for themselves. Why do you feel so protective, you cannot protect them. Everyone has right to do and learn from own mistakes. You should support them but should not put barriers on them. Let them become independent so that they can handle their own lives. How long you would be alive to protect them. So better let them learn now before they tell you please do not interfere.
They may not tell you directly, but they will start hiding things from you, then definitely it will be more risky. Because in that case they are agitated and you wont know whats happening and wont be there to tell them whats right and wrong. When they grow up to become adult your role is to guide them not to impose on them.You need to be with them instead of becoming their barrier so that you can hold their hands when they need you.