Okay, I think this is an issue of culturally different views on free speech and self expression. The US for example holds these things above anything else so it would only make sense to allow the use of these symbols no matter what context. Germany in contrast drew the conclusion from its past that you cannot let anyone say and promote anything they want, that there need to be SOME boundaries on personal freedom and self expression to prevent especially fascist ideas from spreading.

It's just differences in culture.

To further illustrate this: I get immensely weirded out when US media mention the names of crime victims or suspects. Because we don't do that and we think it's important to protect the individual's identity, more than to inform ther public of somebody's potential crime.