When the pirate King was executed, why didn't his crewmates go help him, and his allies
They respected his wishes, only true friends do that. He got himself captured knowing the consequences.
All the ones on the trip to raftel did when roger turned himself in after disbanding the crew Rayleigh knew that's what he wanted but couldn't bare to face the execution. Safe to say scopper oden shanks knew as well and he also told whitebeard about it the last time they met and shared sake in the marineford flashback
He actually turned himself in. But he told his right hand man that he won't die, so they probably didn't save him because they knew he couldn't get caught by marnies so they knew that he must have wanted too die
Roger was beating his terminal illness by going out like a g. All his triple OG crew mates had to respect the code
Yeah but still
You have to consider how hard it must've been for them to follow the order they probably cried for a week
probably roger himself dont want to be saved, roger want to die proudly as pirate king in his hometown and for make this execution interesting he revealed one piece to the world for all of people who wants have it.
Because he surrendered
Also, as genius stated, he wanted to reveal one piece to the world
What do you think?