I've encountered many men here who are very adamant about giving up on dating because they believe they have no chance, and they'll argue at length about it.

What's the point of doing that? If you know, isn't that good enough? What value is there in convincing an internet stranger? Why even go anywhere to talk about it with anyone? Wouldn't it make more sense to focus your energy and attention on enjoying solitude and not lamenting what you feel like you can't have?