About why RV shoudl be so against Avi.. I think he has some valid reasons.
He was an honest & upright officer who was doing his duty well. If you remember when he had come to Lallanput , he had not directly gone & arrested Avi. He had come to the haveli & given Avi adequate warning to stop his illegal activities. But Avi had insulted him badly & refused to change. Even when he had arrested Avi in the jungle, he was planning to put him in jail , not kill him until again Avi threw insults at him & taunted him. RV would have decided then that yeh kuch sudharne wala nahi hai & would always remain a gunda spoiling society .Only after this RV decides to kill him (agar RV hero aur Avi villain hotha tho we woudl have applauded him for this.)
Then Arpi shoots at him to protect Avi.. so RV ko Avita pe gussa hoga hi na. And to top it all because of Avi (may be BJ did all work but so what , she did it on Avi's behalf) he lost his job, honor & his good name. Suddenly because of Avi he has gone from being an honorable police officer to being a jobless, powerless person with a tainted character. He has lost his job, honor, character everything.
This would be reason enough for any normal person to see red .. upar se RV ka ego bhi bada hai.. tho uska revenge ka idea bhi bada hoga. And now he is so consumed & blinded by revenge that he cannot separate out the right from the wrong.
Ironically he had said the same thing to Arpi, in the beginning, when she had gone to the police station to ask him to give her a chance to change Avi. He had told her that bhayyaji cannot change for the better as long as he is consumed by revenge against Lal Singh.
hi there
u know u summed it up
short mein its ranvijays huge ego which caused prbs and now his own life is in danger
rv did come across as a good strong person and avdesh bhainsbuddhi ego said kitne aaye aur gaye bachha and then in jungle avdesh sorts of says to him no one wud be there to cry for him if he dies that just made ranvijay fume
and in blind ego he is not seeing right or wrong
thats why his motive is not very strong and thats why his character has been weakend now