Making friends again ... I guess.
First withdrawing the troops, and now trying to investigate into something that doesn't concern us. Well one certainly could look at it that way but I have a different opinion.
If you see a lens in a building is it a laser targeter, scope or camera?

You have 0.5 seconds to make the decision or your crew is dead... feeling lucky punk?
So if the tank fired at the window which the servicemember believed that fire came from. Trying to hold the tank crew responsible for the death of a civilian in a war zone is one thing. but Why is the Battalion Commander and the Company commander being charged for the actions of the tank crew?
Things went like this:
Sergant Thomas Gibson certainly spoted first someone with lenses but he didn't make the decision in 0.5 secs, he waited 10 minutes for others to take the decision for him, namely capitan Wolford and coronel Philip de Camp. The later was the one who ultimately gave the order to shot.
So it says in today's "El Pais" (spanish newspapers) citing Los Angeles Times, and Le Nouvel Observateur interviews with those soldiers.

They defend themselves by saying they were being attacked but all witnesess (the reporters in Hotel Palestina) said nothing was going on, but suddenly the tank opened fire. I'am inclined to believe them as it was pretty well documented (they were filming all the day).

We must also take into consideration that the US military was fully informed that the in Hotel Palestina were journalists (and it was the very same pentagon who told all foreing press to go there so that they would be safe there).

Well it certainly doesn't make the US military look good, because as we all know deliberately killing journalists or civilians is a "delict against the International Community" (literally translated from spanish), and as far as I know Spanish Judges can prosecute anyone who comitted a crime against a national (...remembers pinochet...), of course as long as we have cooperation from the other country. Otherwise we can only fill charges and conduct a more or less complete investigation (and make us feel good).

So why did the judge issued the arrest warrant? the two previous attemps to get the US to collaborate didnt work so now they might get the message.

Yes indeed Politics at its worse. And again I suspect the Spanish Judge is looking at running for a political office.
I suspect he is just trying to do his job. If he wants a political office I think is is out of his mind, Do you think an spaniard would give up a 5000€ monthly (adjusted to the inflation) and a pension of the same amount free of taxes(also adjusted to the inflation) for an elusive political office?