TYPO3 Core

Why? You have the install tool with which you can always add a new backend admin user.
Maybe you want to write a script to deactivate the backend user always for security reasons. And unhide it with a special script.

Hello Franz,

ok that is true ... so forget this entry and/or delete it

But if you unhide it with a special script you can hide it with a special script too!
I think it make sense to hide the option for the own user record.

This should not be the default behaviour. It is possible to delete one's account even on other systems like LINUX and Windows.
But it could be realized for a special 'fool proof' settings, when security is not so important.
For security reasons the admins could be asked to deactivate their BE accounts by themselves when they are ready with their work. A reactivation would be done only on demand by the main admin.

Franz arguments convinces me. But perhaps the user should need to confirm the deactivation of his own account with JS confirm.

yeah, a confirmation would be great and ok with me. text like "you will instantly logged out and user is disabled afterwards"

yes! This is a good Idea ^^

Georg, why did you close that? I thought about implementing an alert message that the user needs to confirm.