There’s the Puritan/Calvinist theological approach to this which is that God scripted it all, we simply won’t care, and don’t worry about the rest. Some people find this energizing and simply come up with hotter and hotter descriptions of hell when challenged.
Then there’s the C. S. Lewis approach (which I confess to being partial to) that it’s a consequence of all people having the power to say yes or no to the spirit of God. If the Buddhist wants heaven, God will arrange for the conversion of his spirit. (Missionaries not infrequently report that the peoples they have gone to preach to, have already had some kind of premonitory revelation about the Lord.) Heaven will view hell as a tragedy, but not as something fundamentally unfair.
I don't find this unreasonable, just a strange and less than perfect way to manage the afterlife.