I did (apply myself). I did work my ass off to get into, and out of, (good) engineering school and pay for it also.
It simply wasn't an option for me to go to an expensive private or out of state school with a price tag of a couple hundred thousand dollars. So I went to the best school I could afford. Many folks are in this boat. It's not for a lack of trying or intelligence - it's for a lack of privilege.
Edit - I also want to acknowledge that compared to many folks in the world I am very privileged. It only serves to highlight my point even further. These statements are less about me personally and more about me recognizing that I, and many others in our HN world are very privileged in one way or another as compared to he average American, or Human.