What is the highest, most fundamental principle?

Cut him some slack.
I brought up the Hippy stuff. Perhaps there so many here (if there are), because most real hippies, as opposed to the freeloaders, had work ethics and were a tad more thoughtful then the crowd chasing the shiny American Dream, with their faith in Hollywood dreaming & endless growth & their entitlement.

Hippies got a bad wrap by journalist interested in selling sensational stories.
Well, not so much bad wrap, an unbalanced one, since okay, yeah, there were plenty of freeloader hippies - so you see even in that little sub-culture society their was the entire spectrum of human ideals and lesser angels, shall we say.

I hope you’re joking and appreciate that humans have an intellectual level of self-reflection that goes well beyond what any other creature has achieved.

That’s a silly sentence, especially for a philosopher to make.
What it mean?

What does a lion’s full belly or it’s next meal, have to do with my sense of self-worth or the value of my life, even if I happen to be on that lion’s menu?

Non sequitur, it is.

Okay please show me where I implied that nature was peaceful harmony, or “well intended entity” - I can’t even imagine what you mean by that “well intended” and have to wonder how much time you’ve spent in natural setting meditation on evolution and such, and how much time has been confined to cities and rooms and getting from one place to the next.

As for “pure” what are you looking for?
The ultimate purity?
What would that look like?

Though nature does seem pretty pure and no-nonsense as opposed to people with the florid imaginations and so at ease with the lies and deceptions.

I was talking about appreciating nature.
Nature doesn’t operate by intentions!
Nature unfolds according to specific and very consistent rules.

I’ve gone into the desert camping and you’d better not have a la-de-da groovy attitude that nature is loving and will provide, you gotta cover your own butt, or nature will swallow you up the way she does, no malice, just gotta follow her rules, or your egg get cooked.

Nature can be trusted - as opposed to the human mind, which is produced by the human body interacting with itself and the world around it and which is mainly concerned with keep itself alive.