Tasers are bad. Stun bullets too.

[Clarks]

This seems to show a mentality where traitor = rampager = fun, and anything that can possibly stop rampages = unfun. Very rampager-centric.

No. It's a mentality where traitors don't have to be scared of doing anything unless they are stealthy ninjas and have three backup plans.

Traitors are generally on their own, it's the cops who have most of the crew on their side. If you can't be bothered to get crew help or to use the flashbangs, the smoke launcher, officer beepsky or your stun baton, then you had better practice your aim.

Requiring multiple shots to stun a traitor means they have enough time to decide that running away is their best option.
It's not about making the job hard for officers, it's to make gunfights something else than a win all/lose all for the traitor.