They take it upon themselves to be the sole judge of what is morally right and what is not. Day trading is essentially gambling of another sort. Real estate is another gamble - you buy a property with the intention of reselling it at a profit, or perhaps earning rental income. And you could still lose money. Of course you do, unless you like to ride by the seat of your pants.
Same thing applies here.
Show me the numbers. Look at it this way. And so it is when we hear of some tragedy where a gambler commits suicide, or causes harm to his family, or something of the sort. Someone's always got to use this as an excuse to ban gambling. Enough is enough.