The protestors in front of the German Reichtags clearly wanted to get into the building, but were stopped by the reinforced glass doors and the three police officers, who acted very differently from what I saw until now from the Capitol Police [1].

In the end the three officers in front of the Reichtag were able to act this way, because they knew that reinforcements in the form of 100 riot police were only 200 meters away. Badly positioned to prevent the initial compromise of the perimeter, but still there to handle a protest like this.

[1] Video of the incident in Germany. I think the intent of the protestors to enter the building is visible: https://www.youtube.com/watch?v=OdX5952CFTU