If you have a problem with some of the protestants you can voice your concerns. But stop judging everybody participating.
But yeah they should be free to continue to self-incriminate themselves on Telegram and elsewhere. It is not like they are some kind of sophisticated state level threat.
Just because you label a protest march as "spontaneously going for a walk", it is still a protest march, especially if you organise it (here: via Telegram groups).
The German constitution (art. 8) generally grants the right to assemble peacefully and without weapons without requiring an explicit permit. However, if you plan to do it outdoors in public space, you need to declare it to the local authorities (with the intent to ensure safety for both the protesters and the general public). Spontaneous gatherings are exempt from this, BUT, if you organise a "spontaneous walk" days ahead via Telegram, arguably it is not very spontaneous anymore.
A declared demonstration can be approved with additional requirements (e.g. limiting movement to predefined areas) or even prohibited, provided there are grounds that it cannot be conducted safely. From what I can see, the reason that many anti-covid protests fall victim to this, is that the audience has demonstrated a tendency to break regulations that are in place to ensure public health and safety (e.g. mask mandate and distancing).
If you don't like the regulations, you can protest against them. If you break the regulations however, you cannot.
These "Spaziergänge" are an unholy mixture of racists, anti-democratic groups, anti-vaxxers and lots more.
The far right has found "new friends" in the people critizing the Covid rules of the government. They are now marching side by side, obviously trying to make their far right positions look "not that bad" by blending in with the others.
Yesterday they were marching against immigration, today it's Covid.
edit: Oh, and they are organizing and spreading misinformation via Telegram. Also there's your obligatory dose of self-justice and murder calls against politicians involved.
Infiltration also isn't as easy as it sounds. They can use that as a defense. Which actually happend several years ago. They failed to get rid of the NPD, a Neo-Nazi party, because they couldn't be sure if their plans were legit.
https://en.wikipedia.org/wiki/National_Democratic_Party_of_G...
Getting a company to obey the law is probably easier.
But sure, it's just a "difference in opinion".
They want to be accepted by the majority? Then they need to stop walking with literal Nazis.
BTW I just found this https://www.welt.de/politik/deutschland/article236205086/Ver... by accident.
So even the Verfassungsschutz is saying that the majority of the protesters are "usual citizens".
I don't want to persuade you of anything. You can think what you want. You should just leave the same freedom to others and not frame them because some nutjobs are part of a protest..
Have a nice day.