Du to Feddit.org being a German instance we have to follow German laws, which means we have to remove illegal contents. This comment did violate German law by being incitement to people.

§ 130 StGB

Anyone who, in a manner likely to disturb the public peace,
1.
incites hatred against a national, racial, religious or ethnic group, against sections of the population or against an individual because of their membership of a designated group or a section of the population, incites violence or arbitrary measures, or
2.
attacks the human dignity of others by insulting, maliciously denigrating or slandering a designated group, parts of the population or an individual because of their membership of a designated group or part of the population,

The comment was in A Manner to disturb the public by being a public post. It attacks the human dignity by dehumanising a group based on their world view. Under current German law this is incitement to people.

Even if you may agree with the message behind this comment you have to understand, that the mods devinetively had to remove this to not make them vulnerable against the German laws.