Common sense?
I don't like it when things suffer, fuckhead. That's a genuine human reaction to something that it's in pain, whether it's a rat, a cat or a friggin' bird. By your logic we're lacking in common sense for feeling sorry for human beings because they're responsible for many more death and suffering than any rodent can hope to do. I don't care what kind of tag you put on these animals, vermin or not, you either have empathy, or you lack it.
And as I said, some people consider other humans as vermin (ie. bums). Does feeling sorry for them make you any less of a human being? Don't dodge the question like a politician, asshat.
You are bagging people for feeling sorry for something just because you do not. Fuck off, little child.
Oh, is that pity I'm detecting?
So you do care. Then stop pretending to act tough and edgy by bagging people who have empathy for another suffering animal, when you clearly share the same concerns. Dickwad.