I don't really understand the argument the poster is trying to make here, since the point in the OP appears to suggest that RAW/India is Pakistan's 'existential threat' and that Pakistan/Pakistanis have allowed this threat to exacerbate by 'taking on the US'. However, subsequent posts by the thread starter suggest support for 'friendship and normalization with India', and a potential 'joint effort against non-Asian intervention in the region', which is an argument that debunks the point being made in the OP.
With respect to the threat from the US - the US has, directly or indirectly, been involved in terrorism in Baluchistan and FATA. One of Pakistan's most wanted terrorist leaders,Brahamdegh Bugti, and other members of his terrorist group, was comfortably living in Kabul under the protection of Afghan and US officials (and in their full knowledge according to US diplomatic cables quoting US, Afghan and UN officials leaked by Wikileaks). Those cables indicate that the US and UN conducted negotiations with BB when an American was kidnapped by the BLA terrorist group. The same group has also taken responsibility for scores of other bombings, kidnappings and massacres targeting the GoP, non-Baloch ethnic groups in Balochistan as well as pro-Pakistan Baloch.
Despite all this, the US officially kept denying that Bugti was present in Afghanistan (Musharraf made these statements repeatedly) and sheltered him for years, and eventually assisted in his escape to Switzerland for 'political asylum'.
On the FATA front, terrorist attacks from Eastern Afghanistan against Pakistani villages and security forces continue, as they have for the last several years. Many major TTP leaders (Mullah FM from Swat, Mullah Faqir etc.) escaped and found sanctuary in Eastern Afghanistan after being routed out of Swat and FATA by the Pakistani security forces, and there is as of yet no sign that the US/NATO is looking to deploy a greater number of forces to target these terrorists in Eastern Afghanistan.
All of the above would indicate that the threat from the US to Pakistani national security is significant, and may in fact, in the immediate term, be greater than that posed by India, and therefore, the confrontation with the US is a necessary one.