This is in Germany. They have a different history than we do in the US. You will find laws like that in France and other nations that where under Nazi rule. They are a democratic nation and it is up to them to change their laws if they see fit. Canada also has laws about hate speech that would not fly in the US. The US never had Nazis in control of our nation so we feel the best protection is freedom of speech. In many places in the EU they do not feel secure in that. The US has stricter restrictions on porn because of our culture. Although the restrictions are really very minimal outside of broadcast TV and radio.
I hate when a bunch of people from Europe start spouting off options about the US's rules. Germany is a free nation so let it's citizens decide what works best for them.
This line of logic might be fine for Nazis, but ultimately it has the problem that "a free nation" is not just a statement about the derivation of rules but also about some meta-rules that govern the process of rules-formation itself. This is sometimes called constitutional (not in the capital-C sense) or meta-political ordering that goes beyond the individual policy choices. One of those meta-political rules that I think has merit is that, irrespective of the democratic nature of the process, no body-politic ought to be able to suppress organized dissent or prevent those from offering a contrary platform. Otherwise, I think you (in general, not in Germany ever) risk the run of falling into the "one-man-one-vote-one-time" trap where a democratically elected government is able to use the levers of power to permanently embed itself.
Ultimately, I'm not losing any sleep over it.
[ FWIW, I don't think there's anything wrong with (polite!) normative comments about contrary policies abroad. I have no problem when people from Europe say (respectfully) that they are bewildered by American support for the RKBA and that, if they were the voters here, they would not chose such a policy. I disagree with that, but they are entitled to their opinion and no one should begrudge them that. ]