mati:
Writing about spanking children is anyway problematic as it is never right to spank children in reality. So I don't think it's becoming better if you try to be "reasonable" in your stories. Being reasonable would only mean that somebody could think spanking children could be justified under certain circumstances. So why not just enjoy the implausible over the top scenario?
A most pertinent and impertinent question! I think I can answer it for my own sake, and telling from a lot of stories in here, the explanation may apply to others.
Although my realistic and rational self does not believe in spanking as a punishment, there is a "romantic" and irrational part of me that thinks differently. This part believes in a world with strict boundaries between good and evil, right and wrong; a world where the evil and the wrong gets punished, and where punishment leads to improvement, atonement, and forgiveness. Although punishment is painful, this world feels strangely safe and orderly — there are always people there to straighten your ways when you step wrong.
Reading spanking stories is for me — at least partly — an escape to this safe fantasy world. As in any kind of escapism, I am looking for stories that reflect and reinforce my fantasy — I seek stories where the spankers are loving and considerate, and where the spankees (at least eventually) admit their guilt, accept their punishment, and reform their ways. Stories where the spankings are too harsh and the spanker seems cruel, works against the fantasy and are unsettling rather than comforting,
Let me add that I have other reasons for reading spanking stories than nursing my own escapism, and that I also enjoy stories that are funny, insightful or simply well written. But this just and well-ordered world remains tempting....