That's actually the hard part of it. The emotional control. If you are in a position where you have lost too much, the mentality is to get back what you had lost and get the revenge that you want. This kind of emotion is not easy to control because we are thinking that we are being treated unfairly.
A responsible player will stop at that point and maybe just call it a day. Better, he won't be back anymore because he felt cheated. But those who have so much pessimistic lingering in their mind will keep coming back to get their revenge.
Unfortunately, it's not easy to keep our inner selves in check, the ones that fight to get what they want, and rightly so.
In fact, every day the silent enemy we face, the most terrible and the strongest, is ourselves.
We must, however, do our duty and try not to succumb to pleasures entirely.