A father can make offspring and walk away. It is not easy to stay and raise your child. It takes work and commitment. Unfortunate for some kids those two things are not required to make children. Humans can make babies and walk away. They can give their children away to others. Humans have a choose to parent their babies or not.
Facts are little humans are better adult humans if they have a father, biological or not, in their lives consistently and long term.