As a former civil engineer who now works in software, “software engineer” irks me. “Engineer” means you’re supposed to be licensed and you have a responsibility for the public good above your responsibility to your employer.

This. I think some people don't understand that titles are not whimsical status symbols and hold actual legal and regulatory meaning. A random guy can hold an engineering degree and not be an engineer, while a random guy with no degree can actually be a engineer if he jumps through all the hoops.

In engineering fields, being a member of a professional engineering body is critical to work in the field, because the main value proposition of these credentials is to prevent incompetent people from working on critical tasks which can potentially have important consequences to society if they are done poorly. For example, people can die if an engineer signs off on a project for a residential building that collapses due to shoddy work. If that happens then the engineers who signed off on the project will be investigated and if they are held responsible not only can they be held criminally responsible for their work but their license will be pulled, which is society's response to ensure this problem won't happen again.