So by extension, you're saying if I setup a directory on my website called /admin and don't password protect it, then you could be committing a criminal offense if you decide to access it?
Personally I think there is a difference. If there is NO security, then it could be argued that it was intended to be public. If there is security, but it is bypassed, then obviously that is a violation.
So I'm with you that the difficulty of hacking isn't related to the severity. But in the particular case of having no PIN, no password protection, there is no hacking taking place. So it's a moot point IMHO.