The primary problem is unskilled readers, IMO. There are just too many of them. I've had predictions happen, and yes even for things I could "free will away".
I think most things in life are certain, but readers just don't always know or see it. They guess, or see a small part of the big picture, or mis-translate, see years down ahead, or lie. And even the semi-skilled ones are not at all consistent. No wonder the accuracy rate of most readers on here suck.