Is the origin of the hadiths of cursing prohibition, and that no cursing of a disobedient Muslim was mentioned in either the Qur’an or the Sunnah?

The difference between cursing (لعن) and forbidding (نهي) is significant. It is improbable that narrators would substitute the word "curse" with "forbid," especially since the fundamental principle for trustworthy narrators is to transmit exactly what they heard. Accusing them of error without proof opens the door to rejecting the Sunnah.

The fact that the Prophet, peace and blessings be upon him, was not a frequent curser (لعّان), and that a believer is not a frequent curser, does not negate his cursing, peace and blessings be upon him, of those who deserve to be cursed. A frequent curser (لعّان) is one who curses excessively, not one who curses when it is permissible by Sharia. Cursing has indeed appeared in the Quran for those other than disbelievers and hypocrites.

A distinction must be made between cursing a specific individual (which is rare and severe) and cursing a characteristic or attribute (which is common).