@Mr.:
I'm also curious to know why Akainu has such an intense hatred for pirates. His family was probably killed by pirates when he was a boy, then he joined the marines and quickly rose up the ranks by mercilessly killing one pirate after the other.
I'm going to be creative and guess, his father was a pirate, and wanted his son to grow up as a pirate to, but he did not see eye-to-eye. Then something like other pirates kill his father, or he kills his father because of the terrible stuff he does takes place.
I could go on, but it would be pure fanfic at that point… actually Ima just go ahead and write a cool lil story in a spoiler tag, now that I have the idea in my head
! Akainu's father is a pirate captain. He wanted Akainu to be a pirate. Akainu wanting to impress his father followed his ideals, until they ransacked and destroyed a village with innocent people, robbing and killing them. Akainu then couldin't agree with his fathers views, but did what his father requested, killing and robbing people. When he became strong enough, he killed his fathers crew, and took his father in for his bounty to the world government. When he brought him in he requested the position of a marine. They let him in despite his past, gave him the bounty gold and he used that to benifit himself in the marines, bribing some of the now dead vice admirals to get his positioned moved. He also took all the left over gold from the ransacked villages and used that for himself as well rather then paying it back to the villages who lost everything. Somewhere in between all that he ate his devil fruit.