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Well, knowledge of Nietzsche's words combined with ignorance of their meaning has at times been quite dangerous.
Nietzsche can be called an 'experimental thinker' because he changed and developed his thoughts in new directions over the course of time so that persons of all couleurs, both the right and the left, have used his writings selectively and uncritically to support their own iodeologies and agendas.
Somewhere Nietzsche says (I am paraphrasing), "Bad readers plunder a few things they can use, then condemn the whole." He has had many bad readers.Knowledge certainly is dangerous (like dynamite!).