You're on my ignored list, along with The Thriller, so I don't see your posts unless I'm logged out, or I go looking for ignored content. Regarding dispersing the crowd outside the White House, the police were entitled to use force if they felt the protesters were hostile or that the President or his staff could be threatened. At the time, there were other protests happening in DC and throughout the country that were unruly to say the least. Other protests that began peacefully had deteriorated into violence. These protesters were already yelling and starting to throw things. The protesters should have received a warning or should have been ordered to disperse first, and it appears the police made some attempt to do this. It probably could have been handled better, but it looks like the military police acted on their own initiative to push the protesters out. It's normal policy to clear a security radius around the President.
So sorry, but no, that's not an 'atrocity.' You'll know the difference when you see what real atrocities look like.