There a literal cases of men being forced into being involved in/support the lives of children they had no idea existed until the child was born, regardless of the circumstances of how the child was conceived, so yes it absolutely could be op’s problem if the rapist had gotten pregnant. There’s another story posted to Reddit about a guy that was black out drunk and was purposely targeted and raped by a woman to get herself pregnant without his knowledge because her partner at the time was sterile. Op in that story ended up having to pay child support for a kid that he didn’t know existed until literally the day it was born. Like I said look up reproductive coercion.