Dear Sangom,It is all due to extreme material greed of human beings, mostly Indians in this case. In the guise of promoting tourism to Badrinath, Kedarnath, etc., all the natural resources which can be sold and turned to cash, have been exploited recklessly - and for several years now.
Nature is such a huuuuge force that when it just shrugs, thousands will die. This simple lesson which even the primitive barbarian man knew somewhat, has been forgotten by the present day Indians and the governments.
What you say may very well be true. But, it seems that natural calamity of such a magnitude has happened in those areas even in the late 19th century. Please see the attached image. A caveat: I found this on social media. Not sure about the authenticity.
When such a calamity happens, there is a tendency to push through agendas (anti-development or global warming or even atheism) done most often than not without due diligence and as an excuse for poor remedial response.