You, sir, are an idiot. Simply put, there is no excuse for your lack of computer skills. Anybody that goes about randomy deleting stuff from their hard drive without knowing exactally what it is is a moron.
But worse, then blame it on Apple? You are not worthy of a Apple made computer or operating system. Have you ever gone into the Windows folder on an XP machine and deleted anything? Unless it is like notepad.exe, I am almost positive it will have the same outcome. And note, if you have ever openly browsed your C: drive on an XP machine, the windows folder is COMPLETELY OPEN.
As you said, it was a software glitch that made the usr folder visible. So why blame it on Apple you dumbass? Blame it on the third party software, if ANYTHING. I mean, any system file requires admin priviledges to delete, so I guess you are at fault, since you authenticated to delete a system file.
Retire you computer now, and go back to the typewritter. There, if you mess it up, you don't have the ability to alert the entire world to how much of an idiot you are.
And They Said the Mac Was Intuitive