It's more of a crime being proportional to the punishment thing. Stealing even a candy bar is obviously wrong, but having your wife leave and your entire life ruined is a bit much. We don't execute people for stealing cars even though it's obviously wrong, you know.
Obviously shit was happening between them way before the stealing ordeal.
This very incident was just a trigger for her to leave the family.
But yeah, I agree with the whole MUH SHAME and your whole life ruined shenanigans.
Anyone else confused why there's no real romance between Havia and Frolatia? I thought her whole marriage ordeal was all a set up for Havia to move in and 'rescue' her since's he's an aristocrat too.