Because you then rely on the safety, you rely on the airbag, you rely on the rollcage, you rely on the harness when you push the issue to save your ass. Sadly this stuff fails sometimes.
There have been lots of LEO's and others ( bad guys and innocent) that have been unintentionally shot because the safety was not being used when the weapon was being handled or slung. <Straight outta the guys keyboard (glockmaster and FWIW he's been in LE for over two decades and currently the chief firearms instructor for a state LE agency that has 1800+ sworn members so he has a grasp as to what goes on in the LE community.< Gospel right)
Apparently cops are reckless and negligent, you pick whichever term you like better.. Who'd a thought. He said it, not me. Flame suit on
As for slopping around and banging off of gear. I guess it would be hot/safety on (I contradict myself here because safeties fail) or empty chamber safety off. Both ways skipping a step (empty/safe on). Either way is up to you.
I may be out of my league but, it seems like stupid police politics to me.