A shiny Absol is something someone would have to want to see in there times playing the pokemon games, while I agree that the red makes it look more aggressive and dominant you have to remember that and Absol is a soldier of the night, rather than being a thuggish pokemon and picking fights wherever it can find them, an Absol is pokemon of peace and helps humans when a natural disaster is about to take place it tells the people of the impending doom and guides them to safety! Of course an Absol being mistreated is something to gasp at doing show would make people understand how much power one can have and never to mistreat pokemon that even though look shy and observant can still be a vicious battler.
Hmm well if you ask me I'd say spiritomb's shiny form looks like demented toxic bubblegum. shiny absol looks cool and i like it. it has a feel about it, sorry but i can't exactly comprehend it myself, that makes you think along the lines of more "I'm gonna kill you" kinda look, but that's just my opinion.