Tasers are bad. Stun bullets too.

[Clarks]

I'm a bit wary of so overtly encouraging guards to use lethal force after spending months softly prodding them towards being a bit more chill towards folks they capture, but ehhhhh

I'd like to see whether having bullets that hurt would restrain cops from going rambo on every traitor.

What I've noticed is that once a traitor is caught most of then they end up stripped of all their gear and, if they are not mob-killed, once their sentence is up they are out with nothing but their jumpsuit. Seldom there is some cool cop who doesn't seize traitor items, or that puts them in a place where the traitor can recover them once jail time is up.
Like Dauntasa said, being captured is often just as good as being murdered.

Plus a single bullet won't usually kill you, so you can scramble to get it taken out and get back in the game.