The India - China equation is very different from USA - Vietnam, it was USA who went into Vietnam's land to fight while India was fighting for its land under threat from China... moreover at present Vietnam does not have ill intensions or reason to cause harm to USA nor USA has any bad intension towards Vietnam, the fight between them was ideological and both decided to move forward"¦
For the China – India it is very different, if you look back into the 1000 years history, you will find both the countries had excellent relations and India never had any concerns of its security under threat from TIBET / China. So why this sudden change in last 50 years or little more? If you recall that same China after been beaten severely by Japan in 1930's & Second World War has turned paranoid and xenophobic, and with the coming of power of Communist in China it became bad to worse and the communist went over drive to seize more land from its neighboring smaller countries. China annex TIBET in early 1950's and the world did not come to its rescue except few eye brows rose and one should not forget the first attack of the combined Chinese and North Korean forces south of 38th parallel driving the south Korean & US forces up to Pusan. Then China turned its intension towards India and its greed for more land was the fall out in 1962 war.
Personally I do not believe that the India - China hatred is due to 1962 war, we had small border issues likes in 1975 & 1987 too. There may have border issues between two countries those can be resolved through negotiations. But China post 1962 always had ill intention and wanted to cause warm to India, as China did not stopped with 1962 war, then Zhou enlai in 1963 / 1964 proposed Pakistan for a jointly attack on India to cut off Kashmir[for some strange reasons Pakistan backed out from it]. In 1965 and 1971 China fully backed Pakistan in war against India. The most unfortunate and breaking point is the clandestine supply of Nuclear & Missile technology to Pakistan for sole purpose to be used against India in any future conflict, there is a very strong reason to believe that China exchanged the Uranium enrichment technology that Pakistan had stolen from Belgium / Europe with the Nuke design from China, both stand to gain from this transaction. There is intelligence report that China did carried out the Nukes tests for Pakistan behalf in 1980's so that Pakistan does not get caught with the ghost of sanctions. It is also a well known fact that all the Pakistani missiles are Chinese origin only and China still continues to help Pakistan clandestinely to this date.
This is China for you a responsible member state of UN and that too one of the five permanent member states. China has ill intension and wants to cause harm to India there is no two thought on it. India needs to be very vigilant and cautious to China's motives.