I don't know why, I have never dated a single dad, or been approached by a single dad and asked out before, but if the guy was nice, polite, and we meshed I would go out on a date with him.
Single dad wouldn't factor in when it comes to just going out for a date. I think maybe they don't want the baby mama drama that might follow, idk or maybe if worry what if he is the one for them and there is already a ready made family on his side and she wants her husband and her to create their 1st child together and a single dad has already done that with another woman. Idk. Everyone probably has different reasons as to why.
“If you worry about what might be, and wonder what might have been, you will ignore what is.”