Because dropping a smiley is not constructive. And what's wrong with changing the topic? People stopped talking about Snafu and stuff, I happened to watch the worst movie ever made and decided to post my feelings towards it, and people felt like talking about Cinema. It's not like I'm breaking a rule or something. Don't justify your post, just avoid doing it in the future.
Disclaimer: If you don't agree with my opinion, I'm not a comic reviewer or a writer, I'm just an asshole. Also, I'm probably drunk right now.