9.0 bsdinstall usage

I have installed 9.0 bata2 from cd and the net. In both cases after the 
completion of the install and rebooting, the bsdinstall scripts still 
remain on the new installed system. If I interpret the code logic 
correctly, bsdinstall can ONLY be used for an original install. It's not 
intended by design to be used any other time, unlike sysinstall. I think 
the "auto" script should have code added to remove all traces of the 
bsdinstall environment at the conclusion of the install. This way 
bsdinstall fulfills the original design goals and guarantees no one can 
exec it by accident and kill there running system.