German here:
The dude didn't do satire. He straight-up went on a tirade of insults against Erdogan in a way that contained literally zero satire (i.e. criticism by exaggeration), and was found funny by approximately nobody.
He even declared he knew that what he was doing is illegal but he isn't actually doing it and only reading the "poem" as an "example".
It is obvious to basically everyone here that what he did was roughly equivalent to saying:
"I know it is illegal to call for all people with black skin to be murdered, for example with a speech that would roughly go like this: <insert 5 minutes of hate speech calling for the aforementioned> But what i did is different, see, since this is only an example!"
There are very few germans who're actually opposed to having Böhmermann be hit with the full legal force, since:
Our very first law states that the human dignity shall be inviolable. This means insulting someone without actually engaging in satire can be countered with a law suit, usually punishable with fines. Insulting a high-ranking foreigner representing their nation elevates the punishment to possibly a few years of jail, since suddenly that person is playing with the fate of the rest of Germany while also violating a person's dignity.