Major risk to block your Macintosh HD for access for everyone

in Finder/Macintosh HD/Get info/Sharing & Permissions;
if you think, like I did, that you can block others to view the content of your HD by blocking "everyone" and change the setting to "no access" you are blocking also your system and the admin! You can not even unlock or undo this. It took the support desk several hours to get this sorted out. It is amazing that this is possible, I can not think of any useful applicability of this setting. So for idiots like me this should be made "idiot proof" by not allowing this setting or at least by a strong warning what the consequences are of this setting.

V.K., with all due respect, those of us who have had virus issues and switched to Mac don't see changing permission to the drive to "no access" for an icon with three heads ("everyone") as an "idiot" move.
What is idiotic is that Apple released an OS that does not have so much as a warning pop up when this choice is selected. It is not obvious what destruction this will cause. FYI - most mac users are admin users - there is no other way to install updates. There is no good reason for the average admin user to have this capability. You should be required to login as Root to do this. Full Stop. This is just shoddy programing.

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