TL;DR: As the title says.
Today sec status gains from killing NPCs is tied to the bounty payout. Hence NPCs without bounties like sleepers and especially trigs don’t provide sec status gains upon killing.
With more and more NPCs in k-space having their value in drops (which is good!) this makes it harder to help with sec status on the fly while doing events.
Cut this bond, and you are free to make all bounties become drops in New Eden.