I'm not so sure, really. If a reasonably well respected employer phoned in a tip about an employee looking up what they thought were terrorist-y things on a work computer (we'll never know what they actually phoned in, I'd love to know though!), I'd have expected that to generate an investigation for quite some time now.

The worst I can possibly think of to accuse the cops with in this case is showing up with too many people. One or two uniformed officers was all that was necessary.