US saved India from Chinese agression in 1962? Funny story. China captured whatever they wanted to and still keeping it.
Did you forget the more recent Bangladesh war? US sent their 7th fleet navy to attack India to help their ally Pakistan. Because of the communist soviet support and the courage of Indira Gandhi, USA was humiliated and went back without firing a shot and we won the war.
US is afraid of India overtaking them economically and militarily in 20-25 years. So they will try all they can to delay it. An attack under some pretext is one way of achieving that goal.
