According to believers in the inexorable damnation of the unreached, why should they be punished in Hell and not be given more merciful alternatives?

Inspired by a thought-provoking comment section discussion about an [answer](https://christianity.stackexchange.com/a/86261/50422) to my previous question https://christianity.stackexchange.com/q/86233/50422 , I would like to ask a follow-up question: According to those who believe in the inexorable damnation of the unreached, why is punishing the unreached in Hell (possibly for all eternity) a better deal than other more merciful and compassionate alternatives, such as having the unreached go through an afterlife rehabilitation program, preaching the gospel to the unreached in the afterlife so that they may at least have a genuine chance to decide if they want to get saved or not, etc. I mean, any alternative other than being born in the wrong time and place, only to be surprised at the time of death with a boarding pass to eternal damnation, without any chance to revoke it whatsoever.