It depends on what coin you are investing. Not all coin that printing loss is a scam. Some of them are just underperforming that's why investors lose confidence. Maybe you are attracted on coin that has no fundamentals that's why you said that stats. Maybe if you purchase on IDO you might get scam but if you are buying only on reputable exchange such as Binance, There's only a small chance that a scam can enter there and you are aware of that since it will be controversial on crypto mainstream media.
People do make the mistakes that leads them to getting scammed and they just never know that. There’s no way that you can put an end to scamming at all, even if you should capture all of them that are scammers in the world and lock them up, there will still be other people that will come out and continue from where they stopped and that’s just it. So instead of hoe to stop scam, we should be thinking of how to avoid scam.
I once saw someone that complained of how he was scammed a few times, and even at that he still never learnt a lesson and continued to look for strangers online to do business with. Such would put him in a position of getting scammed over and over again, because he has never learnt his lesson. Until he realizes the mistakes that he’s making and corrects them, then it’s not going to work out at all. Just like you have said, people should only make use of reliable exchanges like Binance.com, and when they decide to use decentralized exchanges, they should make sure that they are trading with that has proven to be trustworthy.