Law's flashback is one of the best I've seen (all the emotion in it) and one of the best things about the Dressrosa arc.
Oda did well with making Rocinante/Corazon extremely likeable that when his death comes you will get saddened by it.
Fact 1: Cameron/Kotetsu is not disliked by everybody, stop saying he is, there are people in the fandom who do like him. I am one of those people.
Fact 2: The majority of people who like unpopular characters are always the most nicest and sensible and, therefore, the best people of the fandom.