Why are you posting that here?

u probably should watch the movie again.
as u can see on first scene of movie, andi (rama's brother) was killed by bejo. and some scene showed how angry and emotional rama when he knows it (andi's funeral, and how he so angry while taking the mission from bunawar cause the death of his brother) this case becomes his first priority to kill bejo.
and the other side, when ramas finally gain trust from bangun's child, uco. he become undercover cop. in order to hide his real identity he have to act like a "berandal" or thugs or gangster or whatever u named it. so yeah hes just doing hes job so his true identity won't revealed cause when its happen, of course he's dead.