Nepal goverment has given 10 years visa like OCI. So why still dual citizenship why? If NRN has invested the money they are holding as a bargaining chip in Nepal few years ago, so many people would have got jobs and saved manpower. I think they will take that money with them in heaven.

How can they enter Nepal with Nepali passport when they get departure stamp in USA passport? Will they get arrival stamp in Nepali passport in Nepal? and then when they return, do they get departure stamp in USA passport? Because USA will see your arrival and departure dates to and from Nepal in your passport. This is how they use 2 passport? If american goverment find out they will be in deep shit? 
It is mentioned in both india and china's law that they need to rescind USA or whatever countries citizen to get india and china citizen?