You should only play with money you can afford to lose. When you have money coming from a loan, you are forced to protect it, and under pressure to win, you will eventually fail because the house always wins.
Very true. We should gamble with the amount of money that we afford to lose. It is a very risky way to take a loan because the chance for the return isn't quite high. Mostly gambling just relies on the luck, we can ensure how much we can earn money from gambling. Meanwhile taking a loan, it means we have the responsibility for the repayment and the interest, too. This is surely to be a pressure for us. How we can gamble with calm mind if we have that high pressure? Gambling with no calm mind probably leads to easy losses.
By the way, I personally totally avoid taking a loan because I gamble for fun. With the loan money, I can't enjoy the gambling games. And I think it is also not needed since having fun doesn't always mean with huge money.
Yes, the arguments should be such that the amount of money you are gambling with is considered to be worth losing. I see the negative effects of gambling in those gamblers who underestimate their own talent and waste money by making random bets without applying their abilities. Most of those gamblers believe that if luck is in their favor, they will win. Gambling creates more harmful situations for gamblers who take the initiative to gamble with borrowed money and lose. As a result of the more losses, those gamblers are mentally unstable and continue to gamble randomly, increasing their risk of losing more money. Where calm decisions should have been made to win.