Is the author trying to show how "great" and "perfect" the MC is? Then there likely won't be repercussions, in fact we may never see any follow up. Only we the readers know that our pleasantly helpful Home Center employee is still someone you'd be willing to ask home improvement questions to, and can trust them. A "fool me once, shame on you", sort of situation.
Is the author showing us how naive the MC is? Then, very soon, those same bandits will do very bad things to people/things the MC cares about making the MC think it was his fault for those actions. It will be a "moment for growth" if you will. Likely, breaking the morals the MC has and forging a new set of less-forgiving morals. This would be the "fool me twice, shame on me."
Will the author emphasize how moral others are? Honor among thieves may show up and the MC, by saving the lives of the bandits, is now responsible for an "honorable" quasi-military group. A less dark version of "the MC is now responsible for the actions of those he's saved."
Is the author showing how desperate the bandits' situation is? Perhaps these are the only surviving townsfolk of the seaside town and they've turned a little depraved due to all their family being killed. I'm not saying that all goblins that raid, and have control of towns, would drive people to bad choices, but it's possible that's where the author is going.
Is the author showing how our MC is changing the "common sense" of the world? We know our MC is already influencing the rabbitfolk, crafting a safer place to live with more modern life amenities, and the goddess stated she wanted a revolution. Part of modern life is not murdering everyone who's crossed you, and more importantly not needing to do so. Going from revenge "eye for an eye" to a more complex system of "crime deserves punishment". We may see him codify laws, or, we may see some laws go in to place from people observing his modern behavior.
Is the author making some sort of Byzantine plot? We might see the bandits return to a leader and now our MC is on the radar of a powerful organization he'll have to deal with in the future for good or ill. Maybe they're even "privateers" sent out by some king somewhere.
Speaking of large organizations, does the author like a recurring "evil" punching bag? This could be Team Rocket situation. Our MC is making a very nice target of the village for a bandit group to try to raid. But even with just Ash-- I mean Masaru, they're vastly out of their league, and if all goes well the rabbitfolk are likely going to be well trained and better equipped. The bandit group may be a recurring group of weak, but hopeful villains.
I mean, one of the tags is Slice of Life.