Using Kokushibo's narrative from the manga, it makes more sense. Historically I think the dad would have been seen as cowardly if he had demanded his wife to kill their newborn or ordered another to put their hands on his own child. Basically "purging" the bad omen himself as the head of the household?

Does that make sense for the same man who's always fussy over superstition and had held the belief that Yoriichi is a wicked child who'd bring disaster? Which literally made Yoriichi distance himself from others to avoid the possibility of bringing harm to anyone? I figured he'd be too repulsed

AU belongs to @sm0lbetch and I love it so much, their fic is linked under the cut, go read it and give it love!

Yoriichi is many things: he is heroic, giving, and kind, but for the world (and to himself), Yoriichi is the strongest, which is how he is defined and treated. His brother envies him, the corps shuns him for failing to kill Muzan, and he holds himself accountable for the death of his family and for saving the world. It's really hard to fault him or others for having all these expectations because Yoriichi possesses otherworldly powers, but all these hopes can take a toll on him and help isolate and even dehumanize him. To everyone concerned Yoriichi is god but not to the Kamados

When he meets the Kamados and saves them Yoriichi is at a low point of his life burdened by failures and losses, Sumiyoshi offers him to pass down his legacy and a chance to talk but he refuses because to Yoriichi it must be foreign to take and unburden but even The strongest is still a human so he comes back later in seeking a listening ear and shares his story with Sumiyoshi who accepts and sympathizes with him, sees him as a person who is wounded, despite not knowing how to react or ease Yoriichi's pain he lets him speak which is already plenty because it created the space for him to be a person instead of a symbol and when Suyako shows up to find him in tears she pats him gently and offers to make him a meal, two simple but genuine actions that touch his heart and lighten it up a little and inspire him to give the family his precious earrings and pass them the sun breathing forms

By simply letting him talk, by making him food and by being the living reminder of his good deeds, they gave so much healing and strength to Yoriichi who in exchange gave them the power of the sun that provided them protection, strength, and healing for many generations

Tanjiro undoubtedly stands out in the story for his unique form of breathing, but you could argue that he stands out for his kindness just as much. As helpful as his physical strength was in his journey, it's his kindness that kept him afloat, pushed him further and made him friends and allies. It is his kindness that literally lifted him up and pulled him back to life with the hands of every person he saved with his gentleness