Delete all the index.html file "Directory access is forbidden." when using .htaccess

They protect from a miss configured sever. If you open an folder without a index.html file, it will display the content instead.

Like this:
http://mirror.imt-systems.com/centos/7/

It won't show the content if you have an .htaccess "Deny from all" in the folder or in the parent folder.

True until:

• Someone accidentally (or ignorantly) changes the server and removes mod_authz_core. OR
  
• mod_authz_core gets corrupted and fails to load during one of Apache's periodic restarts. OR
  
• Someone thinks that "those files that start with a dot don't do anything" and can be deleted.
  

Do not scoff at these examples I have seen and had to fix all of them. You may know what you're doing but the next guy might not.