Each person holding crypto might have very different needs, incomes or ways to spend their time. I'd say, along the lines of BTC being the most permissive form of money, everybody is free to use it as they please. Profit might be the goal, or maybe not. Who knows what obscure reasoning might be behind each individual's decision to hold crypto, but there's very little to be done about it. 
Agree, we are learning from everyone's mistakes, if someone are holding tokens and turned out to be scam, then we are realizing things that we should be very careful with the coins/tokens that we are investing at, it's not good that we are just investing because they are new and seems legit, we should validate things by making a solid proof that they are really a legit one.