I'm sorry, but I don't have specific information about the 'Eddie Luna Madera murder'. There could be many murders with different stories, and without more context, it's hard to provide details.
Since I don't know the details of this case, common motives in murder cases could be things like revenge. If Eddie Luna Madera had some sort of feud with someone, that person might have wanted to get back at him.
The caricature of Aguila related to America could potentially be a satirical or humorous representation, maybe highlighting certain aspects or stereotypes.
This kind of situation could cause various reactions, depending on the context and the audience. Some might find it inappropriate or offensive, while others might view it differently.
I have no definite knowledge on this. It could be a term used in a niche manga or related fan community with a special meaning. But without additional details, it's difficult to determine the exact nature of the connection.