I think your entire comment makes you sound incredibly ignorant and completely uneducated. To make a generalized statement that all single mothers have “already destroyed their lives” by having a child is not only untrue but also such a ridiculous thing to say. I can pretty much guarantee that if any single mom were given the magical chance to go back and “undo" having a child, none of them would do it….not even one. I know I certainly wouldn't. My daughter truly is the most amazing thing that has ever happened to me and to be honest, my life became meaningful only after she was born. It's also completely untrue that a man who dates a single mother would have to deal with the child's father for the rest of their life. Any respectable mother would make sure that co-parenting with her child's father remain completely platonic and civil for everyone involved.
Another completely untrue statement you made was about going out on dates. You said that a guy who dates a single mother can pretty much expect their dates to typically include her children tagging along. Seriously? I've never heard any single mom talking about bringing her children with her to go on a date with her boyfriend. Have you ever heard of a babysitter? Because that's what they are for. I also don't know any single mothers who are still sleeping with their child's father… or as you grossly put it, “heating the leftovers". What kind of single mother's are you associating with? If she's sleeping with her child's father then she isn't a single mother, she's an unfaithful woman who sleeps around…
You also say that single mothers who have multiple children by more than 1 father are quote, “irresponsible”. Umm, wouldn't a woman who takes cares of her children… a.k.a. takes care of her responsibilities… make her a responsible woman? I'm still trying to understand your logic on that one.
Your entire comment strongly advises guys to date a woman who doesn't have kids. Well I have news for you; the dating pool is pretty slim pickings if you're looking for someone who has their shit together, is serious about a relationship and doesn't have something wrong with them that explains why they're single. It's even more slim pickings to find that special someone and make sure they don’t already have a child/children. I'm not too sure what century you're living in but this is 2019, not 1950.
Just because a woman with kids had a failed relationship with the child's father doesn't mean there is something inherently wrong with her. It simply means she was smart enough and courageous enough to do what was best for her children by not keeping them in an unhappy, unhealthy, or even abusive home.
So in conclusion, I would say that after reading your response you are not only completely incorrect about literally every point you attempted to make, you also clearly have no idea what you're even talking about. Actually, I would bet that you don't even personally know a single mother and likely never have. I would also bet that you are smack in the middle of the dating pool of men that has something wrong with you which explains why you're single. Good luck waiting for and finding the woman who has all the qualities you want, is single, mentally stable and doesn't already have children! My guess is you will be waiting a very long, long time.
Oh and by the way- You sound exactly like the type of “man” who, if given the opportunity to have a child, would be the entire reason that child's mother became a single mother in the first place! Honestly.