Well, he only killed twenty five people, it's not like it was a really awful crime. He also was a nice guy in prison, working in the laundry and so on, so that really counts. And he did do 14 months for each of his victims (21 years for 25 murders). So, what more do you want?
Seriously, what the hell is Spain thinking? Is this some kind of joke? Symbolic prison sentences of 3000 years, time off for "good behavior" in murder cases, child rapists let out after a ridiculously short sentence - or doing no time at all! I know we Yanquis are brutal barbarians with the death penalty and all (not in all states), but I'm sorry, this guy should not walk out of prison ever, neither should child killers. Pedophiles can not be "reformed" and guys who kill 25 people revoke their right to live in society with the rest of us, even if they convert into Mother Teresa in jail.