I wasn’t the person who originally commented, nor would I exactly consider them bastards (either no dogs are bastards or they all are, depending on how literally you define it, if you ask me), but I was trying to weigh in on the negative aspects of police dogs.
Though for what it’s worth, I don’t think there’s functionally a difference between “bastard” and “possibly harmful and untrustworthy.” If someone warns me someone else is a bastard, I’ll take from it that they’re untrustworthy and possibly harmful.
But I was just looking for a lighthearted chat, and it seems like you’re trying to be serious, so maybe my commentary here is unwelcome.