They’re not evil, but they’re dangerous as hell and not to be trusted. They have all of the qualities humans value in dogs, but their owners are liable to use them to maul innocent people when they need plausible deniability- especially during protests, where a large crowd can be blamed for the dog’s “overexcitement.”
Like, I’m sure an ex K-9 dog would be a wonderful pet, but I would watch the fuck out for them while they’re still employed.