It was explained at the end of Haruka's route that the two fathers were trying to help the mother "escape" that twisted family. I might be remembering wrong but I think one of the fathers (the one we meet in the story at the shopping district) took the blame for the whole incident and intentionally made himself a criminal to protect the mother and the other father. Either way, it was not an excuse, the fathers were trying to "free" their mother and the unborn children from the oppressive family.
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