self-fulfilling projection

I was talking with some friends about some related questions today, and noticed that there's another lens on the role of choice in mindset dynamics, which is in the realm of self-fulfilling... beliefs? Stances? I'm not sure what to call them exactly, but basically the thing where to a large extent people who treat the world as hostile will encounter a hostile world, and people who treat the world as friendly will encounter a friendly world. Thus, since either belief is true for those who hold it, might as well choose the one you want. I've oriented to growth mindset like this, for sure. In some sense, arguably, this is even what a mindset is.

It seems to me though that this runs into exactly the same issue though, where if the choice is so obvious that why does it even seem like a choice? Answer there, it seems to me, is usually that the choice as conceived is still missing some other knowing. Sure, in general people who treat the world as friendly will encounter a friendly world, but does that account for the time you (or someone you know) got screwed over by trusting?