Fail to delete demos directory breaks enabling process with drush

I download the module with drush and then I try to enable it. But it seems that drush fails to delete the demos directory - and aborts the whole process. That's not really what I expect it to do. A notice would be good - but why force me to run drush en again?

$ drush dl getid3
Project getid3 (7.x-2.0-beta3) downloaded to sites/all/modules/getid3.

$ drush en getid3
Drush was unable to remove getID3's demos directory. You should do so manually.

$ drush en getid3
getID3 was already installed to sites/all/libraries/getid3.
The following extensions will be enabled: getid3
Do you really want to continue? (y/n): y
getid3 was enabled successfully.