Others are here to learn from their trials and errors just as you are.  Would you have them not learn their lessons?  Why do you wish to correct others?  Yes, keep others safe.  Yes, keep them from harm, but listen to the words that you are about to utter before offering advice, whether solicited or not.  Of course you will not allow another to step off a cliff when you know they will fall, but if another is in the process of growing and they are content to be learning, allow them their progress.  If you were to turn the mirror around, there is a high probability you will see some lessons in progress reflected back at you as well.  Learn on and know you are loved.  No one ever said this would be easy, but you do not ever walk alone.