Clearly, the majority of Spanish people did not trust the present right-wing Bush-and-Blair-allied Spanish government to find the truth about what really happened in Madrid, what they saw was the Government exploiting the tragedy for propaganda purposes without producing any evidence that could really convict the people the Government blamed the mass murder on. They were very right to throw out this Government immediately, in the interest of Peace, Truth, and Justice.
Unfortunately, the next "suspects" to be accused of the crime were "Al Qaeda". Now, whenever you hear that word, remember that the CIA trained, armed and publicized Al Qaeda as convenient "enemy", giving the U.S. Government a pretext to invade anywhere in the Arab and Islamic world: wherever some U.S. Administration could see a "national interest". Here's two good research resources on that:
So if "Al Qaeda" did it, what we are really talking about is a CIA orchestrated operation, possibly employing a few mislead Islamic militants as patsies. And indeed, the supposed "evidence" here rather ridiculous. A Madrid newspaper is conveniently "tipped off" and receives a video tape where an Arabic-looking man takes credit for the crime and says "You love life, but we love death". It might as well have been a video of some dude saying "Hi, I'm Satan, I enjoy killing you people and being in your newspapers"!
For the moment, most Spanish people seem to find this bogus story a bit more credible than the bogus story the Aznar government told them. And after all, wouldn't it be understandable as retaliation for Aznar's government supporting the US/British invasion of Iraq. I don't deny that such retaliation could possibly be involved, but the version we have been told so far is unlikely to survive a few weaks of investigation.
All the same I'm chorteling "Hurray! Hurray! Calloo! Callay!" because this time the tragedy did not play out the way that the right in Washington DC, or in Spain, had been expecting. The Government which supported Bush and Blair in invading Iraq is gone. The Socialists now set to take power vocally opposed that invasion at massive public ralleys.
It would be in the interest of these "peace and justice" socialists to seek the truth, the whole truth, and nothing but truth about what really happened in Spain's most deadly day since the end of their Civil War, over a half-century back.