Communism is rarely attractive for a majority of any people in a democratic society. In the Nepali case, the devil is in the details: for example, will the ceasefire allow civil government to be restored in rebel controlled areas? I don't pretend to be an expert, I just think the Indian interest and that of the US are substantially similar here.
It's foolish to think one can make deals with communists. They take one step back and two steps forward. The end result is always the same.