Until you need SWAT to kick in a door with actual murderers on the other end. Really until you need violence to contain violence.
Then you get into the real questions: in their day-to-day interactions such as issuing citations are they intimidating citizens with behavior or their appearance? I've known several Military folks who later became police (and had significantly better escalation of force training from the military) who looked fierce but were big softies most days. No better friend, but no worse enemy and all.
The murderers behind a door thing sound scary tho, how often do you think that happens? Vs like every other encounter the 700k american cops do each day? Also uh, uvalde? maine? Seems like we might be optimizing for the wrong thing here and also it doesn't even work.
https://web.archive.org/web/20190116204016/https://www.syfy....
Instead of arming the police force to the teeth, how about reducing access to weapons? It just seems completely insane that civilians have access to powerful weaponry, making it necessary for the police force to engage in an arms race with the public.