Any issue in Pakistan has an direct impact on India and following are the issues which might arise if fanatics gain momentum in pakistan.
1. Pakistan has nuclear Arsenal. 2. Any fanatic getting a foot hold in pakistan will first attack India using those arsenal, UN or any world body cannot control that. 3. If any of these happens that will be a major set back from India. As this will have hardly any effect on pakis, It is a failed state so it hardly matters even if we retaliate.
US should take control of all arsenal of pakistan and india can take help of US to stop cross border infiltration and training camps.
Atleast the above will help india's cause to some extent