What the idea is is, is that if heaven does exist, then it is a place of infinite sadness or all a big lie. Why is that? Well, because if we don't all make it to heaven then there is bound to be a lot of people expecting to see someone who didn't make it. I know it wouldn't be heaven to me if certain faces were missing. It would almost be Hell thinking of them wallowing in purgatory or suffering for eternity.
Thus the sadness.
So a calculating God would ensure that the images of those banished to Hell would be there, though that could only be a facsimile of a soul.
Thus the lie.