Why the hell do you think REAL science actually do missions like this? If they already knew everything there was to know, like the quasi-religious neo-Velikovskian nutters over at Thunderbolts, then there wouldn't be any point in sending them, would there? That's how we learn things. We know more today than we did 10 years ago. We knew more 10 years ago than we did in the 60's, etc, etc.
The mechanism of the dissociation of the H2O has turned out to be a two step process, but it is still dissociation of H2O, initiated by a photon.
Surely the fact that there is H2O to dissociate is far more blushworthy for EU.
Not to mention the density. Or the lack of any electrical activity.