The public notion of good policing and the actual practices police departments follow have been diverging for several decades (if they ever converged). What we're seeing right now is not some inexplicable increase in bad behavior or cops deliberately targeting journalists. For modern American police this is just business as usual, except the volume of deployment is significantly higher than in the past few decades and the visibility is much higher as well.
Edit:
There is a flip side to this coin. When you have a systemic problem of this scale, you should be cautious about making simplistic (especially moral) judgements about individuals in the system. When someone's training, incentives, position in the community and even equipment nudge them towards bad actions, even decent people will routinely do bad things.
As a meta note, I've noticed that people often respond to comments saying "I'm shocked with a recent occurrence of X" with "X has always been bad and been happening for a long time" and in my opinion that response only serves to desensitize people to the bad thing.
By next week this will be pushed out of the news. By November it will be completely forgotten, except among the minority who it directly affects and were already aware. All of the outrage you hear now will not translate into change.
So when people say "X has been bad for a long time", people need to hear that as "and this time you should remember it and do something".