Although I have noticed a pattern.
After making a nice post, there are a few post of what progressives would consider 'bad news'. Posts about the RW Mantra as told by media.
The pattern fits training mantra, although false since it is trying to create a pattern of bad thought after some thought that is nice, and only has an effect if someone thinks backing down to those that do bad is something to do, or if a person thinks they do something, hence why standing is what seems best.
Although I also think there are two groups, and they see things opposite, so really I think the people that run to try and punish people when people are kind, are just turbocharging their cars on the way to the cliff. No matter how many times you say something nice, it just makes them want to head to the cliff faster.
I find it all really interesting. Although those that hurt people, like it seems some do as 'punishment' for doing good and kind things, is not new. And most people are mostly good, so really it is just an out of proportion posting when bad seems to spam after a nice thing.
So if you think what the OP says is true, it could be a perspective.
Grand Funk Railroad - We're An American Band
http://www.youtube.com/watch?v=6yOayjt2tGs