I think one needs a lot more information to come to a far conclusion. The link provided in the original post appears to only account for 6,284 murders. The other FBI page states an "estimated 14,748 persons were murdered nationwide in 2010". Some of the other FBI tables list a total of 12,996 murders.
Either way it seems as if thousands of murders are not listed in the link in the original post, therefore one can only spread misinformation when important facts are not made clear.