Well, those statements doesn't have much thought on them.
San Fermines is much more than blooming bulls. Bullfighting is the part where drunk Americans love to go. There are free concerts, fireworks and pee smell everywhere.
The clothes have a religious significance (remembering how Saint Fermin was killed by tearing up his limbs and guts with wild bulls on the city arena during Roman times). It has nothing to do with killing animals. It is also very practical to recognice posh people as they won't have them dirty after the celebrations.
And the game as stated before has too many projectiles. Also, I wouldn't like to kill all the citizens of my former city with weird looking balls. That is quite wrong.