What a stupid question why a lot of scams...They earn money by taking them from the stupid, such people were always and everywhere, and to protect themselves is not so difficult,enough to study projects.
So you mean to way that if you study projects and if it is good then that project is not scam and you invest it. I can show you so many ICO whose project reports are so good but even then at the end they scammed or can say that when they hit exchange no one is their to buy and the price goes zero in minute. So calling stupid to looser who got in scam dont mean that you are smart as it shows that how much you have lost your investment in scam projects.