The previous power plant manager had, of course, already signed a contract agreeing to those terms; the power plant is subsequently under new management and upset about being bound by this contract, so they designate that none of their suppliers of parts and fuel are allowed to have any commercial dealings with the pen manufacturer or use these pens for any purpose, even writing.
And why would the manager ban the manufacturers pens even for writing, except out of spite to punish the manufacturer? And coming back to the real case, is the supply chain risk designation supposed to be a punishment or only there to actually protect the supply chain?
It turns out that a gun is usable for both legitimate and illegitimate reasons, and so it’s rational to both be concerned about the presence of a gun and work very hard to make sure only reasonable people are ever in a position to use it, and that’s not a contradictory position with the notion that one might actually need a gun under certain circumstances.