>>720059742
They were corrupted by his presence anon, they were magical cell phones except they only had one number in the address book and calling it puts you on the line with Satan himself. They were purified by the defeat of Sauron but Gandalf and Aragorn both acknowledge that the palantirs are accursed due to Sauron's presence and treat them with as much wariness as they would treat the rings of power as, essentially, one way trips to instant corruption. Aragorn only survives his mental duel uncorrupted by Sauron because he has admin rights over the palantir network.