Imagine this scenario: You are running a jail RP when suddenly a guard throws a grenade at a large group of innocent prisoners, causing mass RDM/freekill. Right after the grenade explodes, he hits ALT F4 and you can't ban him, unless you knew his BL_ID beforehand. Or maybe someone is using events to crash the server and appear as if they are "hacking" to the uninformed who don't know stuff about hacking. Either way, someone does something ban-worthy on the server, and leaves the evade a ban.
Enter the solution:An addon that lists their BL_ID when they enter or leave. So if you didn't get their BL_ID before they left, you still have a chance to ban them. This would be incredibly useful if you knew how to ban BL IDs instead of from the admin menu.
then the problem is that the admins are idiots?