title: Drupal: do an unstable module introduce bugs that are still present even after the module is removed?
body: <p>If I download a module which is not stable to run in Drupal (red color over download link), is this causing issues to my drupal installation even if it is not enabled ?</p>
  
  <p>In other words, if I enable it, and use it.. could it cause issues to other modules or drupal core that remain there even after I've disabled it ?</p>
  
  <p>thanks</p>