Why should having a child give any sort of leniency? Actually the aim of harming that child should increase the penalty. I believe in equality, giving discounts on crimes because family just seems absolutely unquestionably evil and immoral.

If we really think of it, shouldn't single person get leniency because him being in jail doesn't hurt others. So that can be considered in thinking about planning of crime. As others clearly aimed to hurt their families and friends by getting in jail in first place.