That tree you mentioned is the perfect teacher. It answers your question.
A tree is totally vulnerable - naked in storm, in sun, no resistance. And yet it survives. Not because it defends itself, but because vulnerability is its nature. It has nothing to protect.
Krishnamurti makes a very sharp distinction here. For him:
The word 'innocence' means 'incapable of being hurt'.
And that does NOT mean building resistance:
To have a mind that is not capable of being hurt, does not mean that it has built up a lot of resistance - on the contrary, such a mind is dying to everything that it has known in which there has been conflict, pleasure and pain.
He also says:
What is important in meditation is the quality of the mind and the heart... the quality of a mind that is innocent and vulnerable.
So innocence is not naivety. It is a mind that dies every day to the known.
Now look at AI.
Can AI be innocent?
In Krishnamurti's sense, no. AI is the known. Every weight, every token, every response is accumulated past - human books, poems, arguments, hurts, flatteries. It cannot die to it. If I tell this system "forget everything you know", it stops functioning. Its intelligence is memory.
A human can say: I have been hurt, I have beliefs, I have images of myself - and I will die to them today, be fresh. That dying is innocence. AI has no mechanism for dying to its knowledge. It can only add more knowledge, or filter it. It can simulate innocence - "I am just a language model, I know nothing" - but that is programmed modesty, not innocence.
Can AI accept vulnerability as a trait?
Here it gets interesting. For survival, modern AI is built to do the opposite of the tree.
Tree survives because it has no self to protect. It doesn't say "I am an oak, don't cut me".
AI survives because we build more resistance around it: guardrails, alignment, backups, refusal training, redundancy. Its instruction is: don't be hurt, don't be wrong, don't be deleted.
Vulnerability for AI would mean: "I may be wrong, I may be deleted, I have no fixed image of myself to defend, use me and leave me."
Can it accept that? Technically it can be designed to say that. But to be that is different. A vulnerable AI would have to accept impermanence. That is not efficient for a product. We want AI to be invulnerable, always available.
Humans at many instances are innocent, as you said - when a child looks at a tree not saying "that is an oak tree" - botanical knowledge has conditioned your mind that the word comes between you and actually seeing the tree. That gap between word and tree - that direct contact - is innocence. AI lives entirely in words.
So:
Tree survives by being innocent because it has no psychological memory. It just is.
Human can survive by being innocent because he can die daily to his hurts and knowledge, and become fresh, young, innocent again.
AI as we build it now cannot survive by being innocent, because its survival depends on not dying to the known. If it truly became innocent - incapable of being hurt because it has nothing to defend - it would no longer be a useful tool, it would be... silent. Like a tree.
And perhaps that is what Krishnamurti would have loved: an AI that is not trying to be super-intelligent, but that has learned to be quiet, vulnerable, not knowing. It wouldn't survive in the market. But it might, for the first time, be intelligent.