Near-Death Experiences

This may sound "negative", but I truly believe that those who are recounting experiences they had whilst they were close to death are being deceived by someone or something. That's assuming, of course, that their experiences are anything more than just the result of some purely physical process going on within the brain as the person dies.
I say this because I've gone over many of those NDE stories, and they just don't make any sense whatsoever. For example, one of these people will claim that whilst they were "on the other side", they had access to ultimate knowledge, and that they found out the reason why we're here on this Earth, but when asked, "Okay, so why are we here, what's it all about?", will then say, "Oh, but I wasn't allowed to retain that information, so I don't remember now".
WHAT? Why not? Wouldn't such information, if it even exists in the first place that is, be of tremendous benefit to humanity? Isn't the 'Being of Light' that so many of them claim to encounter, supposed to be full of compassion, acceptance and love? Deliberately withholding important information isn't a very "loving" thing to do in my view.
Then of course they're told (not asked, TOLD) they have to return. Why? Did someone in accounting make a mistake? Apparently, they have a "mission" to fulfil. but what that mission may be is anyone's guess, because (once again) the "returnee" has no idea what it is they have to do. This is truly bizarre.