I think you’re missing the point.
It’s far less about falling pregnant after a ONS (as happens with many lovely, fantastic, wonderful people of all genders), and more about Shiv being an absolute piece of tit person, and Ned being seemingly okay/normal/decent person. Please note I am not hyping him up in any way shape or form - simply acknowledging that what we have all seen indicates that he is fine and she is a dick.
To everyone saying we’re all making a victim of poor, sweet Ned and condemning Shiv over the ONS - that’s simply not the case, I haven’t seen that at all, and perhaps you are protecting some of your own personal experience into that assumption/conclusion.
Let’s not conflate things. Many people have ONS babies. Many people are not massive assholes like Shiv. The problem is not the ONS in itself, but more that Shiv portrayed it as true undying love, made fun of people who had kids for years and then suddenly changed her values without acknowledging all those that she’d previously been so condescending towards, and also showed no intention of trying to be less of a narc and more of a good mother for the baby.