[M.I.P.]

It's simply the fact that abandoning his family is just passed over like it's nothing important. Shigure whose father set out to be the worst father ever should be particularly miffed at Kensei's treatment of his family. I don't mind him leaving but I do mind him leaving when his kids were so young. I know Kenichi isn't a serious manga but the fact that Renka went through all this trouble to retrieve Kensei suggests that they really miss/need him. I'd prefer it if he had some deeper reason that he didn't tell his family like he left to protect them as his reputation was resulting in too many attacks on them and his school.

As for experience my family life is about as close to the average as anybody elses no abandonment issues or anything.