GoSharkss -
That is what I thought also, until that event occured with my neighbor.
Since then, I find that the installation does make a "key" out of the Kensington lock when inserted. It could alsobe how it was "installed." There may be options.
I agree that it is a good system, and really should work like an interrupt lock. Further, it really should go with you when you travel so you can secure the machine on the road.
All I am pointing out is that it seems to me, based on actual experience, that when installed, the lock can become an interrupt switch. That's good! If there is a continuity loop in the cable, then the thief cutting the cable may not get a useable computer. 🙂