Delete default folders: Documents, Public, etc -- permanently? I do not use the folders ~/{Downloads, Documents, Public} and so I remove them.  But some Mac OS X process keeps recreating them.  

How can I disable the creation of these folders permanently?  What process(es) are creating them?

Note:  I do download files, e.g. from Safari, but they then go to a different directory.
Safari allows this to be customized, so why can't the default directory be erased?

Note:  I have run a crontab to delete these folders on a routine basis, however this
is not a satisfactory solution especially since it needs to be run by root or an administrator.
It's definitively not recommended to remove these directories because a lot of applications just assume they are there. But it's your computer of course, so you can do with it whatever you like.

Instead of hunting down all applications/processes which might recreate these folders you could change their properties to make them invisible in Finder and inaccessible for everything :

chflags hidden ~/{Downloads,Documents,Public}
chmod 000 ~/{Downloads,Documents,Public}