There are an over abundance of these voracious predators. The more killed the better in my opinion, this is especially true around Bonneville dam where salmon are concentrated and bottle necked where these very efficient predators can kill many salmon with ease. In other places I have seen a group of sea lions run through a school of salmon and wound/kill 1-2 for every one consumed.
I would disagree that seals are worse, I have been around both extensively and the sea lions kill and wound many more per capita than seals in my experience. Seals certainly take their bite but they certainly seemed to have much less impact than the lions. This is just my observation and I do not have any research to back it up but seals certainly had less of an impact than the lions on adult salmon in the areas I was in.
Sea lions are essentially worthless but are treated as if they were a valuable natural resource and worth saving and returning to historic numbers when land use and fisheries management have to evolve to the changed the ecosystem to the point where we are spending millions to feed this non-contributing species.
Sea lions on welfare?