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.
However, the police deliberately targeting journalists who clearly identified themselves is something we haven't seen before in America. And yes, many of these cases were deliberate as you can see in the video embedded in the article. Just in a week, there were over 120 confirmed cases, many of which were live on camera. This is an attack on the free press, and takes police brutality to a whole new level.