Do you know what restrictions they were protesting? I live there and can tell you that I would hardly call them restrictions... if you compare it to Australia. lol.
They protested wearing masks in certain places namely museums. They protested about having a maximum of 500 inside concert venues. They want more numbers or unlimited numbers. They protested the 1.5 metre spacing between tables in restaurants. They want no spacing.
Germany yesterday had about 400 new cases but zero deaths and numbers in hospitals is down to less than 300 in the whole of the country! (it was in the thousands a couple of months ago)
Now do you see? what happens when you dont fight the virus and let it play out. It becomes benign and people become immune, if enough of the population get infected