I think they're just trying to save themselves from huge losses but what they did have brought them into a worse situation. The truth will always prevail no matter how we cover up our mistakes. Blaming someone else isn't a good idea and it couldn't even save us from our huge losses. We are only dragging ourselves to bad situations more. It will be better to control ourselves or just accept losses in case we lose our funds since that's a part of gambling. We can't blame others if we are the ones who are making wrong decisions.
Well this blaming is really common for those people who can't accept their losses, they will just blame someone from nowhere just to cover up their mistakes. These people are also about to be addicted in gambling, after they blame someone they will still play the other day and will try to win the game again and once they lose they will try to blame it again on others, it will be a repeated cycle.