One thing that may have changed the calculus for India being more aggressive in it's bombing is that US backing of Pakistan in a conflict with India is no longer a given. Given the covert if not overt Pakistani support for Taliban insurgents in Afghanistan, as well as that Bin Laden was found hiding in Pakistan, I doubt there is any substantial support in the US population for Pakistan over against India. Many Americans have a much higher affinity toward India (world's largest democracy, a modernizing economy, home to many tech companies) and than toward Pakistan. In addition, it seems that Modi and Trump have a much better relationship, and probably have a similar view of the world, than Trump and Pakistan's president.