Dharma adharma, I don't understand, pls. Help

It was Udhister, who gambled his wife and brothers, isn't that adharma?? True that dhrushashan should not have done that but panchali was duriyodhan's dasi. Even udhipster didn't stopped this because he kind of knew that panchali was duriyodhan's servant. But then again, isn't it adharma to treat woman like this? Why didn't he stopped this?

it was aa twisted sense of dharma which resulted in such a heinous crime. it was yudi addiction and gullibility, it was fault of whole sabha relying on technicalities rather than morality,it was fault of a blind king,it was dominance of bro dharma above pati dharma, it was jealousy and revenge which resulted in this adharma