False comparison... There are also mechanical engineers that design trashy gewgaws. And electronic engineers designing giftcard chips. And creating regulations

False comparison... There are also mechanical engineers that design trashy gewgaws. And electronic engineers designing giftcard chips. And creating regulations for the word "engineer" is just a bad idea. Instead the common solution is independent certification bodies (perhaps with some government clout for practices that endanger people). And regardless, you can only regulate individuals within your jurisdiction. Global commerce and services makes the idea of controlling the word engineer fruitless.