Has the world turned into a nanny state where people think it is well within there right to tell people about things that they have no interest in or even participated in. Cause thats how it seems. DICTATORSHIPS don't work, people stop listening after enough abuse.
You's justify your behaviour by saying your doing a public service and trying to save people from this when in fact, you are just inflating your ego's further and accentuating your moral high ground even further.
People learn by making mistakes, its how we learn to pick our selves up. Yes it is hard to stand by and watch people get ripped off by greedy scammers but if they can't see the signs it is a lesson they need. As next time they will be careful with what they invest in, but if people keep advising you know what they do, they come to internet forums to get the views of others rather than learning to trust their gut feeling on something.
Let people live & learn from their mistakes and triumphs, yes its hard but it is essential.