It is not for politicians to decide what is a crime or not, that did not stop a whole lot of people commenting on the Cologne event though.
Upon actually reading what you think you've quoted...
"According to Seibert, Merkel said the poem was “unacceptable” and stressed that the broadcaster removed the content after apologizing on April 1 for “crossing the line into slander.”
So Merkel has not said it is slander, only that she views it as "unacceptable" (which is not a crime) and the broadcaster removed it after apologizing for the in their words slanderous poem. I would suggest that you read twice before you jump to conclusions in the future, or you will end up like Lizardo and believe that Sweden solely consists of teenagers.
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