I think it would be nice to split the distutils/setuptools parts. The problem
with the pure distutils uninstall is how to get the path where the package to
uninstall is.

As it is, the patch it too dangerous, too: it removes directory with rmtree. It
should not do that; instead, it should try to recursively remove the files and
then the directories, only if the directory is empty (with rmdir, not rmtree).