"Of course it doesn't make them not a murderer, but -"
Okay, now she has to somehow explain redemption, and not just how Lady Shelyn sees it but also for all of good and she's only sort of qualified for this. No pressure!
"The evil afterlives are really awful. That's not only the reason redemption is good, Lady Shelyn would ask us to help people atone for their sins even once Iomedae finally slays Asmodeus for good and sets free all the captives of Hell, but that's a reason you might get if you ask a cleric of Ragathiel why they're in favor of redemption. If Ibarra came to a temple of His tomorrow and said he'd realized the errors of his ways and wanted to try and make up for it, they wouldn't just trust him out the gate, but if they could confirm he was telling the truth they'd put him to work on the spot, because even if he used to do evil things that doesn't mean the people he could save from a devil today are any less real. They'd say it's not right to evil hold on to their power because you turned down his help, driving them out of Nidal and Cheliax even a few days sooner just more important than whether or not the person who saved them did evil things. They're fighting to win, not to pat themself on the back for trying. And a cleric of Cayden might say - 'the diabolists of the world didn't just suddenly become evil. They grow up like that because Asmodeus wanted them that way - because he lies to them, every day, tells them that they were born damned, that doing good is impossible and love isn't real and they're pathetic for caring about anyone other than themself, and he keeps doing that until they're twisted in a knot and they believe he was right all along and do evil. But fuck letting Asmodeus be right about it, and if it takes them ten years to realize the truth about his lies I'd still help them prove him wrong after.'
"And what Lady Shelyn tells us is - everyone is born with goodness inside of them. Not just the sympathetic cases, the ones where they joined the Asmodean army because otherwise their family would starve and were beaten for years whenever they thought of making the world better until they were a broken husk of cruelty, but even the merchant who grew up in free Absalom and decided to go work for the Chelish government to make more money in the slave trade or the people who sold out their armies in the civil war to help put the Thrunes in power or Abrogail II herself. When they do evil, it's because they grew up in a broken world where Good hasn't won yet, and even if they don't feel a single smidgen of regret in their black hearts over all the people they'd hurt, when she looks at them, what she sees are scarred and broken children that she just wants to help be okay. Sometimes it takes millennia, for the evil people they snatch from Abbadon and the Abyss to grow into their best selves, but she's not going to quit because the job is hard. One day we'll win, and she'll do the same for all the devils and demons, too, and - the Melodies of Inner Beauty tells us that she will do it for Zon Kuthon too, because even the god of torture is not beyond redemption."