I think this is a very disturbing trend. Pakistan is an Islamic state with rampants Islamism (which is separate from Islam).
1. We Indians however should make sure that we are not guilty of the same crimes. I do not see the difference in the magnitude of the crimes that are religiously motivated. i.e the religious identity of the killer and the victim doesn't make the killing any less or more evil. Only if we ensure that hate crime in our society doesn't go unpunished can we make an issue about hate crimes in another country (even if it is a rival/hostile nation).
2. Why do Hindus still live in Pakistan? Like it or not Pakistan is not a secular country; it's an Islamic state that happens to have a history of supporting extremist Islamic radical principles. Non Mulsims who feel threatened should leave and start lives elsewhere. There is nothing stopping them seeking political asylum in India, where they could live relatively less stressful lives and get more opportunity.