You can learn a lot about someone's character or the OOC person by being a mouse. Specifically in the way of how they treat you, and whether or not that changes when they switch from one character to the next. I've had some pretty positive experiences as a mouse going about the station, and only really one negative one. Regardless of whether someone kills me or not, that isn't a bothersome point from my perspective. I'm a mouse. It's more of how it ends up happening.
Wordlessly stomping on a mouse as you walk by, that seems a bit off. However the one time I was legitimately bothered was when a random assistant came into the kitchen with a hatchet. Tracking where I was under the table, and wordlessly throwing it to kill me. Who powergames a mouse?