User blog comment:Nobody700/The justice of the red dog: Part 1/@comment-4754162-20140127020241/@comment-7890302-20140127021540

I did it because I found it the best and most ironic way to do it.

Having Sakazuki have a special hatred of one would make sense, and having it be similar to Ace makes it ironic because he did kill him, and hates Ace and Luffy mostly because of who their parents were.