When editing a user, you have the ability to either hide or set the default menu bar for each module. However, you don't have this option for the "Security" menu. The only option is to globally edit or delete the menu.
Which Security menu? The one from the main menu can be removed by removing it from the menu list. You don't have to delete it.
That is the one I am referring to. If you look in the account settings, you have the option to hide the menu for each module on a user/group basis except for the security menu (as shown in the screenshot above).
Ok. Interesting it's not there. I would just create a custom menu bar for user/group that needs it and add it their assigned menu bar and delete the Security Menu.