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While at the end, all these doesn't change anything, when they have already lose the game, though as you have mentioned, they catch the forum and in so doing for relieved of the stress on loss, while in some cases, we can discover that the gamblers don't even do such, either they win or lose the game, they move on as they have already expected either of the two to happen, we don't have to be too desperate with gambling, that we must win and if we lose, then feels disappointed for nothing.
A gambler or newbies that wants to start gambling is meant to already know and have a full details of what they are venturing into and knowing that gambling is a game of chance which you are not going to win the way you expect or desire to, winning is based on how the casino's house edge allows you to and you can not blame them because they are there to make profit and not as a charity company to make player rich. Even though some people luckily get rich, it is by great luck.
When you win a gamble you tell yourself that you deserve it because you predicted very well you don't blame anybody for your win but when you lose you tend to blame someone for your losing is that really normal.
Just like you said Dr.Bitcoin_Strange that gambling is a game of chance and one can't be too sure if he or she will win or lose, gambling should be done for fun and not just for the money, if you are gambling for the money you will always blame the team that you played to win and they lost and you may also blame the gambling company which is very wrong.
However when you are gambling for the fun and you lost you will always blame your skill of prediction and you will just try to improve more on yourself, I really don't like when people blame gambling companies for their lost it is a game so when you lose don't blame anybody because when you win you don't blame people.