You cannot say that a country is crap based on one or two cases. Go and see how much money and time is spent on such investigations in countries like US and UK. It will be easily more than 20 times of that in India. So, do you say those countries are crap?
If they are spending in investigating the actual murderers, then you should appreciate the efforts rather than make fun of it. Just put yourself in one of those people's shoes and think, then make a comment. Just imagine you being Aaroshi's mother/relative, then you will know.