Your feeling for this episode was felt by many the same way.
The question for me in this show of Vigilante does not arise because the premise of this show was to avenge a wrong done to a young innocent girl Payal through no fault of hers and her sister coming back to settle the score with the Evil doers.
The passion the audience feels for Durga and her mission of getting justice is because the Goenka's used their Money and Power to buy and bully the witnesses to cover up a heinous crime like Rape.
And if the law was twisted by the Goenka's and justice was not given to the Victims then
as they say ...sometimes one has to bend the finger to get the "Ghee".
Payal and Nitya's family suffered and since the Goenka's went on to live the life of Riley
and forget all the crimes they committed to save their rotten son then now is the time to let them feel some of the pain they inflicted on the Payal and Durga's and their family.
And as far as Dev is concerned let us all hope he does use his brain and not spoil Durga's attempt to get justice.