You're pre-emptive hostility seems rather unwarranted.
This article is my usual go-to and lists several reasons why JavaScript might not be available, and thus why you shouldn't take it for granted: https://piccalil.li/blog/a-handful-of-reasons-javascript-won...
I feel compelled to add:
- the user explicitly disabled JavaScript
- the browser does not support JavaScript (I sometimes view websites using elinks)
AFAIK screen readers also work better without JavaScript, so it's also an accessibility issue.