Lol, seriously? Dude, that's like saying, "Most people sleep at night because they want to rest.".
Well, obviously, why otherwise would someone use their money and buy and sell stuff with it? It's so that they can get profit from it by buying them low and selling them high, it's a simple thing, and anyone should know this, and you shouldn't be saying it like that.

And, what you are explaining is nothing new, and anyone who gathers knowledge about trading before they get involved would know that risk-management techniques are very important because trading is full of risks, and if you don't manage your risks properly, you will most probably lose money in the long run even if you manage to get some profits initially.

Those who trade in futures without stop-loss will have to face its consequences because the market won't always go in the direction you've predicted.