It is going to take some time for the newer users doing this kind of commenting to realize things are different on Steemit. And we have to let them all know and show them how to really engage. I like to think of adding comments as just having a real discussion with people on the topic we are talking about.

As @wekkel commented above;

it would be a bit idealistic to think that Steemit would not attract this kind of posters. I hope the effect will wear off over time. After all, posting does require some thinking. And thinking is hard.