Your typical USPS mail carrier delivering on foot gets attacked way more often by actually aggressive dogs and all they have to defend themselves with is the mail bag and maybe some type of pepper spray. And they go out six days a week.

Cops seem to get to wear heavy fabric rip stop pants, body armor, those gloves with the padding in the knuckles, and carry a small arsenal all the time and might have to deal with one or two barking dogs a year. And blast away anything they come across.