Translate the following English sentence to French:
"It was not only immigrants who were the victims of atrocities; the democratic system in Spain has been held up to ridicule, despite having demonstrated its tremendous capacity to evolve over the last 20 years."
Non seulement les immigrés ont été victimes de pratiques effroyables, mais le système démocratique en Espagne est bafoué, alors qu'il a pourtant démontré sa formidable capacité d'évolution ces vingt dernières années.