Data Spike can be done with outsider access, so you shouldn't need a back door or brute force to do it. It's been said that you can see any devices in the network if you can see the network, so you can presumably choose your target. Bricking a decker's cyberjack would be much nastier than just knocking them out, since they would have to buy an all new one and presumably go through surgery and recovery again.
Even better would be to link lock them, knock them out, then brick everything.