I respectfully disagree, Princess. He is still a pirate willing to do whatever it takes to reach his goals. After he heard me explain why Nico Robin was such a danger, he took her into his crew. He broke Crocodile and several other world class criminals out of Impel Down in order to try to save his brother.

You're friends with him, but what about the rest of the world who isn't? Do you think Straw Hat is going to take responsibility for all the things Crocodile does now that he's been freed, or all the others he broke out? He and his crew are not like other pirates, but that doesn't make them any less of a danger in our world. If anything, it makes them more of a threat there.