Python package installing rationale

[Kay Schluehr]

In almost any case I install a Python package via distutils some
directories in the package tree are left behind e.g. the docs,
licenses, tests etc. I wonder if there is some rationale behind this?
Should it be left to the "creative freedom" of the user to copy the
docs whereever she wants or is there a dedicated place for them and if
any why isn't it simple to declare it in the setup script?