There's some indication the sniper is working to a theme of the American People, American Business and the American President: the shooting at Home Depot, the shooting at a Presidential Taxi driver , "Father, mother, priest and King" on the tarot card, the shooting at the gas stations, the shooting of and threats on children.
Continuing on the "children" aspect. Remember Saddam's usage of "baby milk factories", his taking of British children and families hostage during the Gulf War, his constant use of little children in photos. Saddam is fascinated with children as props and pawns.
And in the recent note: "Your childen are not safe anywhere and anytime". That "anywhere and anytime" is the exact phrase we -- the President -- have been demanding in inspecting for weapons in Iraq.
So *NO*, it is *not* apparent to everyone now that the sniper is a lone operative -- NOR SHOULD ANY SO BELIEVE! For safety's sake the best assumption is that this is one act of war, and others are planned.