If those people can be wise after they lose, they will not thinks to return to casino in the next few days because they remember that playing gambling needs to be moderately and always control themselves. But many people still wants to recover their lose or wants to wins the games so that makes them return to casino and playing the other gambling games whereas they hopes to wins the gambling games.
They will not trying to spends more money because that can leads them becomes addicted to gambling and that's the worst things that they can gets from gambling. Gambling addiction causes lose and they can bankrupt anytime so that's why they must control themselves and not trying to use gambling too often. After all, they must avoids becoming gambling addiction as they knows what will happens to their life.
It's true what you say, if only they could gamble wisely then when they lose they won't have the urge to gamble again or the urge to recover the losses that have just occurred. Therefore, gambling within reasonable limits and not excessively is important, so that there are no bigger losses, the control is with ourselves who will determine how we gamble in the future, if we can't control ourselves or don't have a good policy then losses or other adverse impacts may occur. perhaps the feeling of wanting to recover losses is what makes them addicted to gambling so it is not easy to stop or abandon their gambling habit.
Indeed, those who try to recover their losses will certainly spend more money to pursue their losses, and such actions are certainly not good. because apart from losing more money, they will also feel misery because they could lose everything they have, and even because they can't leave their addiction, they can sell what they have to be able to gamble again.