Edward Kenway was working toward a dream- a dream very “Assassin-y”: he wanted to reach beyond his grasp despite the fact that he lived in a world where the class you are born into is the same class in which you die. He wanted freedom- not from responsibility entirely- but from a world with such rigid class structures. He wanted to let his actions make his class, his riches, and even earn back the love/respect of his wife. He channeled those actions into rather selfish means, but his dream was pure which is why he finally came around to the Assassins’ Order: they believed in a similar liberty of class- actions make the man, but those actions have to be about something bigger than yourself (which is what Edward learns the hard way after Mary’s death).
image from madeinmasyaf