So what will be gained by blaming other parties, will the money spent be returned or will they receive compensation from the government? It all means nothing because each individual does it without any coercion from any party, the attitude of a gambler must actually be able to accept whatever happens after gambling.
Losing is a delayed luck (in gambling), moreover the result will always revolve around two axes (winning and losing), so there is no one to blame other than yourself who willingly risks money that you cannot afford to lose when you lose the bet.
There's no benefit to blaming others for losses; it only escalates the situation. Imagine if the person being blamed doesn't accept what the main perpetrator did, and physical contact might occur. But if the person being blamed becomes emotional, it's understandable. Blaming others for losses is unreasonable, as gambling is essentially voluntary.
I think those who blame others should reflect, as this kind of action is highly unethical. As you said, it's done without coercion. Even if a friend forces us to gamble, we can still refuse.