Throughout the Matrix chapter, marks are referred to as sort of setting your access level. At 1 mark you're a registered user, at 3 that's potentially up to Administrator level. One would assume that people operating computer systems inside a facility would have 3 marks for this purpose, generally making them able to operate the system like it was designed without too much hassle. Common uses for this that I can see is the activation of cameras, alarms, opening doors, etc...
So why do I, when I have 3 marks on such a system, need to take Sleaze actions to do such simple things? The system should recognize me as an authorized user and simply comply, should it not? When I order a device to do something it was designed to do, having the correct user privileges, what kind of illegal activity ripples is GOD picking up on? As far as the system knows, all I'm doing is kosher. It can't possibly be letting its actual legitimate users jump through the hoop of rolling Sleaze actions against its Firewall, so why me?
Even more hilarious is the fact that if that system is linked up to a gun turret, I can use the turret to shoot everyone nearby remotely with it being a Data Processing action, because there's a dicepool for it. But don't you dare open a door or eject a clip from a gun! Logic!