There are five types of stupid internet comments.

There are the basic comments. A predictable unimaginative response that you would expect.

Then there are those with a compulsion to be even handed that try to balance things too much, giving too many examples of the good and the bad on a subject, then they usually come out on the other side and get downvoted. If it's a topic most would see as bad, they end up justifying it somehow because everybody seems to be on a counter narrative, then if its something with a positive feel, they end up second thinking, and ultimately disagreeing with it.

Then there are your One Up mans. Those who try to one up someone else by becoming more extreme. These usually don't get as much points as the older comments, and the longer it goes, the more replies for a single comment, the newer the comments, and newer comments don't get as many upvotes/attention as the oldest ones.

There are your Fill in the blanks people. These are the type of people that will try to the fill in the blanks on a story before all the details have been released. Comments like those are the first ones to get downvoted, especially in the news subreddits because they a typical short one liners.

-Topic Driver plows into crowd at OSU parade

Reply- At first I thought it was an old lady instead of a drunk woman.

Then there are your knee-Jerks, those with reactions that reveal their emotionally charged predispositions toward a particular cause, group, idea, or thing. These often play out as stupid like now we need to change something, and if they're done from a sarcastic since, they get the most downvotes.

Example- Know we should ban all cars to stop these mass killings.