Also, obsession always has a psychological reasoning behind it. I doubt Yash Chopra put that "dead mother" in there just to get SRK's character sympathy.
Also, I really believe that Yash Chopra always had this story in mind with Rahul being the centre of the movie not Kiran or Sunny's character. Isn't that why he offered it to various people, even Sunny Deol? So if Sunny goes and bashes YC then it's his own fault. Apparently, Sunny was asked to choose between Rahul and Sunil, he chose Sunil because of whatever reason. If it were just a normal love story, I think YC might have dropped the movie or changed the character Rahul just to have his first pick do that role or changed the dates around.
I don't remember Darr, to be honest, but I do remember the storyline, the main gist of it. Also, obsession doesn't always mean that it would lead to X raping their target of obsession. Rape and Murder in obsession come as a last resort when stalking and such are not turning out how X thought they would. It's never without any reason - it could be change in brain chemistry like a tumour or a behavioural or emotional issue e.g. loved one dying.
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