Why do North Indian parents kill their child if they have sex ?

North Indians are highly conservative.They are narrow minded people,I'm not just saying without a reason.Usually North Indians kill their children if they indulge in sex.I wonder why North Indians say their culture is so good.Does that mean they give importance to virginity more than a life?Are they low life assholes?How can they kill if a person just for having sex and the worst thing is they are proud of it.They call it honour killings.Have a look at this videos

See this video to understand how North Indian mom treat their children,they treat them like their slaves and look at this mom doing his daughters boyfriend,infront of respecting him,she is beating him.I wonder whether this lady is a mental patient.