Actually, there is no logic in blaming someone else for your loss, did someone give you too much hope for gambling? Did they force you to gamble? It's your money, so if you wanted to stay away from gambling, could they have done anything? No, in fact, we have no logical reason to blame others, you gambled with your money with full knowledge, so if you lose, you will be the only one responsible, there is nothing to blame others for.
Most people do not like to accept that they were wrong, that it was their fault that they lost, it is something that many see as natural, not me , I am not ashamed of that, in casinos and games it is normal to lose, what is not normal is to lose a lot of money, because to bet you should only do what you are willing to lose and nothing more.
Though it's really hard to admit it when you are in the situation most of the time gambler find someone to point their finger, especially when they are losing money, instead of keeping the full responisbilities inside they will find other option to deny their failure in terms of controlling their emotions, it's always better to keep in mind that gambling is risky and needs to be minimize using spare money, it saves your butt losing what you can't afford if you have that kind of mentality.