Even more cringe-inducing: It wasn't fatal. Some more security guards arrive moments later and find him lying on the floor, breathing and moaning in pain.
There was quite a lot of this sort of thing in the third act building up to the climax. Brundlefly Jr. grabs one of the guards in a bear hug with one pair of arms and uses its other pair of arms to fold him in half backwards.
It was one of those great movies full of disposable bad guys who deserved what they got.
Cronenberg had nothing to do with the movie, but it was directed by Chris Walas who was the special effects director on the original Fly and had worked with Cronenberg on some other stuff. It was pretty much just an excuse to go as gory as possible.