Technically the Palantiri were a force for good in the hands of Elves and Men, and could still be used for good, like Aragorn using it to challenge Sauron and forcing Sauron’s hand. So that’s a defense to the self-awareness argument. In fact that ambiguity is likely intentional.
Btw I always wondered why I was seeing droves of Palantir swag on Stanford campus back in early 2010s. I wouldn’t wear something that has a 50%+ chance of being interpreted as evil.
The Palantir themselves aren’t evil, they were made by the elves long before the events of LOTR. Essentially they are just a tool.
However I heard that Thiels favourite book is the rewrite of LOTR from the perspective of Sauron, where Gandalf and the elves seek to destroy humanity and technology (at least that’s how I understood the gist, haven’t read it)
In the books its not just that sauron uses it for evil, he also can use it to turn anyone else that uses it evil.