My impression is that this title comes from the practice of "software engineering", not necessarily that the practitioners are licensed Engineers.
There are no regulations as to who can develop what software as far as I know. Whereas there are for who can design a bridge, act as your lawyer, or prescribe you medicine.
“Software engineer” is just a synonym for “programmer”, in the actually existing practice of the English language.
Call yourself whatever you want, but that doesn't mean you get to define what 'Engineers' are and what ethics they are bound to. Just because you use the term in your title and say it is used properly in English, doesn't mean that you won't get treated any different than someone with a PhD demanding to be called Doctor and pretending there is no difference between them an and M.D.