I think some of you might be missing the joke that drives this show. (This show is most definitely not a serious drama.)
And that joke is that psycho Norman is surrounded by family and friends who, with the notable exception of Emma, are killing people left and right. I've lost count of the actual number of corpses but my guess is that sweet Dylan may have offed the most people since the series started. I could be wrong about that though.
But with one obvious exception, none of these killers are bad people. These folks are the show's good guys. And they're good guys because everyone they've killed is not just bad but really, really bad. As in EVIL.
The exception is psycho Norman's killing of Blair Watson. Though perhaps not the most innocent of teachers, she probably can be considered a basically "good" person and therefore Norman's killing of her would be counted as a "bad" thing. Which explains why Romero was bothered by it and had to know if Norman was lying or telling the truth.