Men taking care of children who are not their blood(unless adopted knowing) is act of kindness, sacrifice(of time, emotions and money) and them being nice. But it should not be something they are forced to do.

I have seen in some infidelity posts people blaming fathers who were victims of paternity fraud for not staying or distancing themselves from kids who are not related to them by blood. Often you see other step-fathers, people in situations where they were kids of affair partner and women criticizing them. To such step-fathers I can only say that while it is great that you stepped up and took care of kids, it's not something you should demand from others and force them to do. To people who were such kids I will tell them while it is great for them if such father-figure/"step-father" steps up and raises them, it's not something they are entitled to have from someone who is not heir blood-relative. To women who criticize such men, you won't even understand such predicament to begin with , unlike you we can't have sex with multiple people and be sure that kids we have will be ours, that's your privilege. And generally IMO the only life I am responsible for is the one I created or harmed. The blame can only lie with people who betrayed their lover/spouse and lied. While some will still try to do their best for the kids, you should not be angry if some people decided to not to the same, and they should not be blamed. Instinct to reproduce, leave an offspring and genes behind is one of the oldest instincts we have and it's not normal that society does not acknowledge that as being important, even though it is important for many people. Laws that force people to pay for the kids that are not their own are disgusting to me.