.. and throw an ugly warning instead! It happens from time to time that user has to switch to native console (CTRL-ALT-F{2..6}) to fix/kill something. Any such login shell (not explicitly logged-out) might there survive for ages and become to be an open door for attacks.
Or please provide this function at least as an optional feature. $ rpm -qf /usr/libexec/kscreenlocker_greet plasma-workspace-5.4.2-4.fc23.x86_64
Maybe a good feature request for upstream @ bugs.kde.org We in fedora will likely not be able to implement this as-is
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https://bugs.kde.org/show_bug.cgi?id=372883