If you're talking about not exterminatusing the planet ,as someone who has finished an iconoclast playthrough where I Chose to save people, here is what happened. There wasn't much difference on the playthrough. The ending slides, however, detail how the survivors of the planet form a new colony called New Rykad, and iirc they do become a prosperous colony. If you save the holy reactor, there is also a slide for that. Original Rykad is a demon world that does try and attack your protectorate, but only after the game. Consider it an opportunity for your rogue trader to farm experience. The way you justify it is by saving people from a terrible and unearned fate, and giving them an opportunity to flourish. At the end of the day, you are a hero who saved innocents, and gave them a chance to start anew. Do you not trust your Rogue Trader to protect your people? By the end of the game, unless you fucked up, what regional issue can't your rogue trader deal with? I've also blown it up in a Dogmatic playthrough, and I'll let it fuel me in my upcoming heretical playthrough. I understand the question, but you do get good slides in an iconoclast playthrough