That effectively silences counterprotests and renders them less effective by denying their free speech rights to voice disagreement in the vicinity of those protesting for causes they disagree with.
This is a gross oversimplification of the history of Germany especially if we’re talking before the Nazi takeover in 1933.
One of the reasons why the Nazis rose into power was that the prevailing law enforcement/military and court judges which were effectively an independent “state within a state” during the Weimar Republic were very uneven in their handling of Nazi and related violent protests/intimidation tactics vs anti-Nazi opponents.
A large part of this was that even as early as the early 20’s, the Nazi party had support from many prominent right-wing leaning military figures including former WWI top general General Erich Ludendorff who took part in the Beer Hall Putsch with Hitler and the Nazis in 1923.
While it failed, the sympathetic judge allowed him to use the court as his political bully pulpit and police who served as Hitler’s jailers treated him and his followers with extreme kid gloves and gave him a light sentence in a very luxurious for a prison settings where he was allowed visitors among other things.
If one examines police/military maneuverings during the interwar period, there was definitely more sympathy/favoritism shown to right-wing political groups…including violent ones like the Nazis vs centrist/center-left leaning ones like the Social Democrats or much moreso…the German Communist Party.
Not too surprising considering most of those right-wing groups were composed of disgruntled military veterans who strongly bought into the Ludendorff “stab-in-the-back” myth blaming Jews, Social Democrats, Communists, and other “undesirables” for Germany’s defeat in WWI.
Ironic considering Ludendorff perpetuated that myth to divert attention from the fact he was one of two top WWI generals who presided over and thus, was responsible for the plans/actions which led to the defeat of the Imperial German Army.
And the establishment controlled mainstream media of the period portrayed the left wing as being the cause of all the violence and chaos when the right-wing groups like the Nazis and some coup-minded military officers and sympathizers(1920 Kapp Putsch) were just as violent and worse, often had some military backing in covert and not-so-covert forms.
And the military establishment finally showed its hand when its senior leaders gave full backing to Hitler/Nazis in exchange for them eliminating the SA/Ernst Rohm because they didn’t want their long-standing traditional dominance over German state and society to be supplanted by what they viewed as unwashed undisciplined rabble upstarts.
One upshot from the weakness of Weimar Democracy and the strong favoritism the military/LEO establishment had toward right-wing groups like the Nazis the Germans took after WWII was to institute strong checks such as an agency responsible for the protection of the Federal German Constitution against political extremism and a ban on hate speech/gestures such as the Nazi salute, hate speech, or wearing/display of Nazi paraphernalia for anything except historical purposes and attempts to constant monitor military personnel/police to ensure they’re not inclined towards political extremism…especially Nazism or similar right-leaning extremist groups in light of their horrific past.