The house is the only property for them. OK, he tried but Baburam is also not wrong.
Is Raghu justified to take the responsibility of finding 5 lakhs at any cost?
Yes. He did his best by asking shivani for help and his putting his life at risk is also justified as he promised.
Shivani is more bothered about morals than someone losing the life because of her stubborn behaviour. Even if Raghu stole, it is for saving one's life. She has failed miserably as a human being.