Nobody in Spain wanted that war, and ow a lot of people are thinking "Had we not participated, this wouldn't have happened". Now, in my opinion this kind of thoughts at a time like this are simply wrong. I didn't approve the war then, but know this (if it's Al Qaeda) is a reason to stay there, not take our troops back. If we did bring them back, then the terrorists would be dictating our policy, and we might as well change our electoral system: the next time, whoever kills more innocents win.
It's true there have been demonstrations against the government, but I was in the big one in Madrid (two and a half million people in a city under 4 million) and there was nothing like that, all you could hear was against the killers, against ETA, Otegi...
In Barcelona, however, there was quite a violent moment against the government. The problem is that the general election is tomorrow and this has made some people (not most people) to start arguing about who's to blame in Spain. This is wrong, they haven't even respected the three mourning days... You can tell which newspaper is pro PSOE or pro PP by seeing if the support the ETA theory or the Al Qaeda one.
Again, if this goes on the terrorists would win... they would divide the nation in some way. I just hope this will be forgoten after the election and both major parties stick together.
And don't believe everything you see on the press, most people are just upset and against the terrorists and most undecided people are now in favour of the government, or at least supporting them during these hard times.
One more thing... NO ONE sympathizes with UBL, but a lot of people sadly mix up pacifism and defencelessness (does this word even exist?)