Crocodile is a good example of the latter example. It has been frequently shown that the antagonists either dismiss "silly" dreams, are living dreams that destroy the dreams of others, or have lost their dreams entirely. Now, what of the antagonists? Let's dive into their stories. The crew is living the dream that many of their friends could never see. In fact, going back to Robin's mother, she searched for the True History out of respect for her husband's dream. Thanks to Luffy's influence, however, she regained her love for it, along with a newfound freedom. Nami's passion for navigation was a natural one, but she lost all joy for it after being forced into working for Arlong.
Luffy had been pressured by his grandfather to become a marine, before opting to become a pirate after the influence of Shanks, Ace, and Sabo. Others have been influenced by multiple sources. Zoro was influenced by Kuina, Usopp by his father, Sanji by Zeff, Robin by her mother, Franky by Tom, and Brook by Laboon. The crew's dreams have been influenced by outside sources. All of these dreams may be difficult to reach, but they are attainable. Sanji may have found the "All-Blue", although we may need more information. Usopp is already a great warrior and a huge advantage to the team. It's possible Franky has already built the greatest ship out there. The Thousand Sunny is by far one of the toughest ships out of what we've seen.
Some crew members have already achieved their dreams. There are a few things about this worth noticing:1).