Because from their expressions there's nothing I will say at that time negative of the scheme that will sound truthful or make sense and I wasn't ready for argument neither.
I do want to know if my idea or decision on this is the right way?
And also have you come in contact with people that invests their money in any ponzi scheme and tried talking them out and what was their response ?
Meaningful opinions are welcome.
At times it is good to let people learn from the hard way, but when it comes to speaking the truth, it is one thing we should never shy away from, not minding whether the people we are telling it to will accept it or not, because by keeping silence, we put them at danger of losing far more than what they would have lost if only someone told them the truth earlier on, even though they may be doubting, but might likely trade with caution.
So for me, I will advise you to go back to your young bro, and let him know that what is investing his money in, may likely crash someday, and as such should invest an amount he can always afford to lose so that if it crashes one day, he wouldn't get affected that much.