I'm always surprised at the number of people who think that long lived isotopes are more dangerous than short lived ones.
I can't speak for anyone else, but I lack a lot of knowledge on the science of these issues. Generally speaking, the only time I hear Uranium is in association with man-made nuclear projects. Rarely do I hear Uranium in association with micro-nutrients and naturally occurring sea particles. Until this article appeared, I had never read that there was so much of it in the planet's waters than could be mined on land.
With that in mind, the idea that Uranium was slipping into the ocean would be understandably disturbing, even given the size of the planet's water bodies and the relatively small amounts of Uranium. A few months ago when I read that the Japanese government was pumping sea water into the reactors to cool them, I was really worried that the sea water would become heavily irradiated, make it's way back into the waters surrounding Japan, and then back into the food chain reaching the Japanese people themselves. Basically, I thought Japan was in the process of becoming a radioactive set of islands.
If the science doesn't support that, then OK. The problem is getting that information out to the general public in an effective way. I remember articles claiming that California was going to basically become toxic due to radioactive particles coming across the air streams from Japan. I already knew California receives pollution from China, so I was a little concerned. I went to a colleague who explained that there was no problem. The average person can't always do that. Hence the fear of Uranium in the world's water supply.