Why Indian Diplomat revealing internal information to US rather than talking to Govt. of India ?

In a recent Wikileaks cable, one strange thing I noticed which is our own Government Personnel revealing sensitive information to US rather than talking to Govt. of India.

According to a Wikileaks cable, Ambassador K.V. Rajan, former Secretary of the Ministry of External Affairs and current Chairman of the Prime Minister’s National Security Advisory Board (NSAB) calls up US Diplomat - Charge Geoffrey Pyatt, and reveals to him that he was invited by the Iranian Embassy.

Excerpts from the cable :

2. (C) Ambassador K.V. Rajan, former Secretary of the Ministry of External Affairs and current Chairman of the Prime Minister’s National Security Advisory Board (NSAB), called Charge May 4 for an urgent meeting in which he told Charge that he had been invited by the Iranian Embassy for an all expenses paid trip for “politicians, scholars and commentators.” The list of invitees in a fax from the Iranian Embassy press section included notorious America-critics, such as XXXXXXXXXXXX. The visit was scheduled for April 28-May 4, and the Embassy said the guests would meet Iranian officials, scholars and would visit “one or two Iranian nuclear establishment(s).” Reports this week in the “Asian Age” and “The Hindu” indicate the group visited the Arak Heavy Water Complex and met with Minister of Energy Parviz Fatah.

3. (C) Rajan told Charge that this trip was part of an effort on the part of the Iranian government to encourage anti-American, pro-Muslim scholars and think-tankers in India to influence Prime Minister Singh’s supporters to take a more pro-Iranian, anti-U.S. view, and that his presence on the delegation would have handed Iran a PR coup. In light of his suspicions, Rajan canceled at the last minute, citing a sudden family emergency. Following is the invitee list, which Rajan provided to Charge: (Full Wikileaks Cable)

Now, the important question is why is he revealing our internal information to a US Diplomat instead of talking to Govt. of India ? Does he work for CIA ? Why is Indian Govt. silent on this ? Why is Main Stream Media silent on this ?