The Ref: What It Is Like to Referee El Clasico

Unfortunately this discussion is not limited to Spanish football:
(last two paragraphs of article)

"Indignation is a very pleasurable emotion. Externally, people grimace, make loud noises and express rage. Internally, it's very satisfying because it always springs from a profound conviction of your own moral rightness. Indignation and self-righteousness are two sides of the same coin.

"There's a feeling of being morally superior to the targets of your indignation. In a football stadium, there's probably nothing that generates more passion and noise—with the possible exception of a winning goal in the last minute – than an opportunity to vent indignation at a referee or a rival player. A referee is incredibly handy—you can go after him all day long."