Why? I agree with all the other things you've mentioned that they are bad and one should stay away from them, but I don't understand why you would call trading bad and why one should stay away from it. I agree that those who understand how it works and what it is should stay away from it because they will lose all their money in it, but those who understand it and study it and gain knowledge and experience about it, I don't see why it can be bad for them.

Millions of people around the world are earning a living with trading because they are doing it in the right way. It's not like gambling where you make a bet press a button and then wait for the result which is generated by a random number generator. You need to know the market and how it moves to be a good trader and that needs time and knowledge.