This is the real issue. Sysadmins tend to have hyper inflated views of their own roles. Many believe they are the only reason that the company exists, and have utter disdain for everyone else around them. Their "if it weren't for me you'd not have a job" attitude is what leads them to have the spoiled, bratty, entitlement attitude that they have.
Dennis Nedry's character has more than a little resemblance to the usual state of affairs in real life. Fat, lazy, obnoxious and totally convinced of their own indispensability.
Oh, and I know all this because I am a sysadmin. Now stop reading Slashdot before I revoke all your Internet privileges.