Silly to talk about "security" of UNIX MacOS since a boot disk easily changes the password. That's no big security.
I'm finding it much more difficult to believe with each of your posts that you are any kind of consultant. If you are, you can't be very good. ANY system can be compromised when you're sitting in front of it. The object, more than anything else is to prevent intrusion from the outside.
With a password requirement, a destructive Terminal command which requires system access cannot run. It will have to stop for an admin password to proceed. A destructive GUI program that needs access to the System or Library folder will be stopped by the admin password dialogue box.
I really don't see why you can't use a one character password. I've been doing it for years. I admit, it was hard at first. I was very afraid I wouldn't remember it the next day. After a couple of weeks, I was feeling pretty confident that it was sinking in. Years later, I'm almost positive I've got it down.
It's rare, but I know there is a disease that causes bones to be so brittle that even mild pressure can cause them to break. I would have to assume you are afflicted with this since pressing two keys instead of one could cause you to have to be admitted to "the intensive care unit".
But for a serious answer, grow up.