While Oda does a great job of utilizing his characters, there are a few instances where he ends their storylines in a manner that, for whatever reason, raised some red flags. Whether it be due to irrational decisions, incredibly unlikely circumstances, or something else, these characters all deserved better.
The very first scene of One Piece depicts Gol D. Roger's declaration of the Golden Age of Pirates, proclaimed moments before his execution in Loguetown. Although most fans predicted there to be a fascinating story behind his capture, Roger's death was instead caused by a mundane source: terminal illness.
Roger was the greatest pirate ever, so it is strangee that he would decide to hand himself over to the World Government, even if he was planning to use his execution as a platform to spark a Golden Age of Piracy. Assuming that the next generation would carry his torch was a huge risk, one that could have been lessened by a separate course of action.