Trading is unhealthy because of so many factors. I will like to highlight the factors as follows: the most principal thing that cause unhealthy market is the fall in price of the mother coin like bitcoin, Ethereum and more. Also, the team members of some ico fail to list the token at a good time in market.
Its true that if bitcoin falls, all the other altcoins dump with it but this is how trading works and traders know about it too. Most ICO fails but these days there are IEO which give you sure shot 2x plus profit. If you know all this, then you can easily get profit from trading. I strongly disagree with OP that "trading is unhealthy".