It's not just professional hubris or exclusionism, it's about diluting the respect and reliability of our profession -- and in some cases, even public safety.
If you were just upset about people calling themselves electrical engineers when they are not, you would have a good point. But as others in this thread have already pointed out, none of the governing bodies you mentioned "own" the term engineer. Just like medical doctors don't own the term doctor; they have to share it with lawyers, audiologists, pharmacists, physicists, psychologists, etc.
The term engineer has shifted many times in the past few hundred years, and it will probably continue to shift. Many engineering disciplines do require licenses, but many do not. And many disciplines that do require licenses have plenty of waiver and exemption opportunities (like the industrial exemption). Software engineering even has an NCEES PE exam which was first offered in 2013, but like most engineering disciplines it is not a prerequisite to work in the industry. It may become required for some safety critical work in the future. I'm not sure how quickly the PE exam became required after it was introduced in 1966.