Given that the intention of arming the Taliban was to bring down a government similar to the one currently invading Ukraine, maybe the overall effect of arming the Taliban was good, however tragic for Afghanistan.
Ultimately, I do not presume to be smart enough to know what is right in international relations.
Apart from the Brahmaputra, which flows through the part of India east of Bangladesh, I have a hard time finding a major India river that originates in Tibet. Certainly, the Ganges flows west to east.
What river(s) do I overlook?
Mighty fine hiking locations too!
https://www.wondersoftibet.com/mount-kailash-four-river-sour...
(I have kayaked the Karnarli, well worth a rafting trip if you are in Nepal).
I think the Yarlung Tsangpo as well comes from one of them.
https://earthobservatory.nasa.gov/images/80558/yarlung-tsang...
Ahhh, wait, in see you said India. That would be the Indus and Karnarli - which goes to the Ganges. Sorry rushed post not got time to remind myself.
There's also the concept of Arkhand Bharat (https://en.wikipedia.org/wiki/Akhand_Bharat) which is the notion of a unified Indian subcontinent.
https://en.wikipedia.org/wiki/Religion_in_India
https://qz.com/india/1585631/the-ancient-connections-between...
In practice, a lot of Buddhists are very theistic. Many of them worship various gods and Buddhas.
In the West, Buddhism has been desacrilized to make it more palatable for Westerners, but in the East it's often way more religious and theistic, especially as the Buddhism that actually exists in those countries has often been blended with other indigenous religions which themselves are very theistic.
Though I read that in the news, so take it with a grain of salt
You might be confused because the Mekong (along with numerous other rivers) originates on the Tibetan Plateau, but that's a geographical feature which is vastly larger than Tibet itself.
A map of the Ganges watershed: https://commons.wikimedia.org/wiki/File:Ganges-Brahmaputra-M...
Looks unlikely that Tibet could exert too much control over it.