Such stories have been released in the media for decades. Free Republic has chonicled abuses by bad cops for years.
If there is a perceived increase, it is probably due (in part) to the fact that more people have cameras and other recording devices on their phones and other personal devices and are willing to use them to record what happens.
Also, with the internet, we can read about incidents in another city and state whereas before, only the most major cases would have gotten interstate attention.
The perception is real. If your old enough, ask yourself when in the early 1950s, 1960s or 1970s law enforcement routinely stormed homes, with heavily armed, paramilitary police, wearing armor, using armored vehicles, dressed in paramilitary uniforms, routinely shooting the family pets, homeowners, and sending rounds into neighbors homes, etc etc.
A few decades ago, it just didn't happen.
I don't mind LE using force against murderers, kidnappers, or extremely violent, armed individuals, but what were seeing today, such as this story on this thread, is very different.