As someone who patrols with new cops a lot I always try to encourage them to go for non hostile situations as much as possible and also to try and RP it out with people. The issue is it is quite punishing to do so. This is simply the nature of perpheads. As a civilian, when you have the opportunity, killing cops is more like an unlocked stage in the pursuit of gameplay, once you reach that threshold killing cops becomes an immediate thing you do, mostly for your own safety so I don't really blame people for it.
But as a pistol cop, imagine trying to roleplay and then getting blackscreened, over and over. Repeatedly. You will begin to think that is the server behaviour itself. Combat over roleplay, always.
Right now, experienced cops also hate hostage situations - because they are just grenade fests. There is zero gameplay reward for roleplaying with cops, you have to deliberately put yourself at a disadvantage to do so!
How would this be solved? Well, personally, I think it is crazy that hostage situations actually work the way they do on this server. The moment the hostage is free, cops just immediately kill the hostage taker.. so what is the point in even .. trying to successfully do hostage negotiations.. just grenade the cops...
PLPD Policy needs to change so that if a hostage taker actually complies, and "free passage" is negotiated, it is actually respected, to a reasonable degree. In order to encourage people to actually want to succeed in hostage negotations, not just 911 the cops with an impact grenade. !!