most of them aren't really at fault. they are just poor newcomers who entered a big market and were suddenly bombarded by a huge wave of advertisement which were promising them riches beyond their wildest dreams so they ended up buying a ton of useless tokens which have been continuously losing value
This is the problem for most newcomers here in crypto world. They are just easy to hypnotize by these stupid advertisements telling that if you invest in here, you will get a huge amount of money in a month or the like.
In my portfolio, around 60-70% of my total holdings is Bitcoin. I bought some coins that I know will bloom in the long run but that is a small percentage only compare to Bitcoin. Its ok to buy altcoin but do some in deep research to prevent being scammed.