Completely different case for Japan they fought and lost the war against US, and were still an industrialized country with near complete mobilization which US cannot subdue beyond a costly main island invasion. The best US can do is co-opt it into its sphere than let Japan be too weakened to be in Soviet sphere like East Germans.
Korea is too small to be mattered even if it became a tech powerhouse(which it became) and also again, the geography of the korean peninsula offered a strategic reach near the core Chinese territory and also near Far East region of Soviet/Russia for US to let if fall.
India has neither attributes (neither fought war against US and there is a chance of joining Soviets in coldwar nor too small like korea), and even before us pakees offered everything including allowing U-2 spy planes to fly into USSR etc and even they regretted the wh0ring they did for US when US stopped weapons supply in 1965 because they did not want India to be completely under Soviets. So, it is hopium to think US would support us against pakees if we were an US ally, because of multiple reasons like 1) pakees are good candidate to box us in, else we would focus more on Indian Ocean which US, like british before won't want us do. 2) pakees have utility in poking russia, even china or Eurasian heartland in general. 3) other mohemmadan allies of US like gulf and even iran would pressure US to help pakees and restrain us if India (an US ally) would kurb stomp them US weapons as
@Hydra desperately hopes to do.
I mean see, turkey-greece (both US allies) that would be us.
It is not to say being US ally is not beneficial materially especially in coldwar era, infact many US allies benefited with american largesse including pakees like US funded and built the whole canal system for them in 20th century after British built the one before for them. They also gave grains, weapons etc, trained them freely etc. It is just that pakeed were too stupid and not at the level like south koreans to use it for their benefit.
kendawg.medium.com
. They need 10B$ worth of terrorists to fill the gap in west of west asia .