That isn't Hamas' slogan.
If the government can arbitrarily designate groups it doesn't like as terrorists and restrict your freedom based on that, then there isn't free speech.
If the government can arbitrarily designate groups it doesn't like as terrorists and restrict your freedom based on that, then there isn't free speech.
"Hamas rejects any alternative to the full and complete liberation of Palestine, from the river to the sea."[0]
[0] https://web.archive.org/web/20170510123932/http://hamas.ps/e...
Also, there is no free speech in Germany. There is freedom of opinion and expression thereof. I'm not an advocate of that, but it's also not arbitrary.
And I am glad we agree there is no free speech. "freedom of opinion and expression" without the freedom to speak may as well be a joke. And I wouldn't be surprised if they arrested people for doing interpretive dance in support of Palestinians.
Also, the swastika predates the NSDAP by millennia. It's still not allowed to use it in a context where it means "death to all Jews". Same is true for the slogan "from the river to the sea".