WI ETA did the Atocha bombings?

So, at first ETA was suspected of being the one who did the bombing (and some fringe (usually right-wing) groups still say that they did it). As we all know Al Qaeda did it and the theory that ETA was behind it (to help the PSOE win the elections the theory says) turned out to be wrong.
So, without further saying, the WI:
What if ETA really was behind it? Not in the sense that now it is discovered that they did it, but in the sense that they did it and got caught in the same way that Al Qaeda got caught (I din't know if I will be understood...). What effects would it have in Spanish politics and the Basque situation the Atocha Bombings if they were made by ETA?
 
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