Ah, it appears cannibalism (or something near it) is enough to make people the world over pissed off at the idea of your existence.
Not really cannibalism (as one species eating a different species isn't cannibalism)...
Anyway, here's how I see it:
The outrage comes from the fact that the guy was intentionally ripping families and crews apart and *feeding* them to his "pet", all while he taunted and jeered and laughed at the pain and horror he inflicted, because it lets people taste his "despair".
And as if that wasn't enough, he comes across as even more pathetic when it's revealed that he's doing it to just keep up an illusion of a time long past. There's no "we must do this for justice", or "this needs to happen because I believe in it", no, he was torturing and brainwashing people and delivering them to a painful death, just so he wouldn't feel *lonely*. He doesn't spare anyone; men, women, children, animals... all are nothing more but plantfood for Lily Carnation, in his eyes.
If it had been just a brief mention of what he did, or if these things had happened to some hardened criminals that nobody knew about, it wouldn't have caused such a big stir world-wide.
But since this is "This Bites!" and not One Piece canon, the people of the world *know* the Straw Hats. They've shared in Luffy's adventures and followed them every step of the way since Alabasta. To anyone with more than two braincells to rub together (and a sense of decency), this crew is now a part of their lives that gives them a sense of wonder and a daily dose of humour, which is a big boon for those that live in the shittier parts of the Grand Line and the New World; it shows them that there's still a sense of decency and brightness in the world. If anyone asked "What is Straw Hat Luffy like?", the entire world would be able to answer the question, even if their opinions on him might be different.
Even villains would be quick to aknowledge that the Strawhats are a respectable crew that *can't* be easily broken apart. And Baron Omatsuri just broadcast to the entire world of how he enjoyed tearing them apart. Even Enel wasn't this disgusting, in the eyes of the world.
Heck, *ANY* crew that sails in the dangerours waters of the world of One Piece would understand the need to be able to trust your crewmates to, if nothing else, do their jobs right and have your back in a bad situation (except maybe Blackbeard and a few others). If you don't have that, you're doomed.
It's like violating Guest Right in the "A Song of Ice and Fire"; it's not just a taboo to do something like this, it's a goddamn intentional sacrilege of everything that a crew is meant to *be*. Even most of those that hate the Strawhats retch in sheer disgust at such an act. It wasn't even done for "Justice", it was done for *kicks*, for wanting to see others in despair and pain. This doesn't mean that there aren't a few people who'd hesitate in doing it, it just means that anyone who has ever been on a ship would understand just why the Baron was such a horrible person.
Or at least, that's how I took it.
*Shrugs*
