A folder and subsequent files in 'nix are owned/operated by users+ groups + everyone else. When root owns a folder/files in that folder, only root can use those folder/files for any purpose unless permission is given to others to use those same folder/files.
In this case, the scripts are owned by root so any user will not be able to run them unless two things happen. 1) either root allows anybody else to run them by changing permissions to something like 777 (read, write and execute by anyone) or 2) including the user in the same group with root thereby allocating those same rights to the user.
Both are not the same however. 1 gives all users the right to use (maybe dangerous) whilst ownership stays with root but 2 shares ownership with user through inclusion in same group (exposure to only one user may be more manageable).
I tend to use 1 but that is personal preference and also cos I'm lazy as running one script like "sudo chmod -R 777 /etc/init.d/couchpotato" solves my problems (note my system is isolated so it works for me whereas 2 may be the best solution for open or not so closed systems.
Hope that helps someone else