In the reporter's defense, there has been no particular US pressure against celebrating the killings of innocents, or for that matter against killings the innocents to begin with. The US — under Carter, Reagan, Bush I, Clinton, Bush II (though to a lesser extent) and now Obama has always viewed the killing of innocent Israelis as a minor annoyance that must not keep Israel from making ever greater and more irreversible concessions to the killers, so as to enable more killings. Israeli objections to the killings are looked upon as seizing for an excuse not to make peace. Now, if you wanted an example of another action that the AP and the White House sees as harming the cause of peace, you would have to cite Israel killing or imprisoning someone who has killed innocent Israelis.