If more reasons were needed for concluding that the current Israeli-Palestinian talks won’t produce a deal, here’s another: the designated mediator — i.e., the Obama administration — has just proved itself incapable of providing what even Israeli leftists deem an essential condition for peace.

Tuesday night, Palestinian terrorists murdered four Israeli civilians — two men and two women — by shooting them at close range. Yet as even Haaretz, normally the administration’s reliable flack, noted, “State Department spokesman P.J. Crowley didn’t seem to be in a rush to condemn the attack.” In fact, he didn’t condemn it at all: he merely declared it “a tragedy.”

“Any time one human being takes out a weapon and fires and kills other human beings, it’s a tragedy,” Crowley said. “We just don’t know the circumstances under which this occurred. … We are cognizant that there could be external events that can have an impact on the environment.”

The White House finally issued an unequivocal condemnation only hours later, once “the circumstances” had become clear: namely, that it could condemn the attack safely, because the Palestinian Authority wasn’t involved. Until then, Crowley had hedged his bets, hinting at extenuating circumstances that “we just don’t know,” “external events” that could affect “the environment” — any straw he could grasp to excuse the PA if that proved necessary.

What does this have to do with peace talks? To understand that, it’s worth reading Gershon Baskin’s column in the Jerusalem Post this week. Baskin aptly titled it “The indefatigable peacemaker’s advice,” because he is indeed an indefatigable peace activist. He is co-CEO of the Israel/Palestine Center for Research and Information, has been personally involved in many previous rounds of negotiations (both official and unofficial), and continues to believe that “the Israeli-Palestinian conflict is resolvable” right now — a position shared by few other Israelis.

Yet even this indefatigable optimist noted that peace will not be possible if certain conditions aren’t met. For instance, he dismissed the “borders first” idea once touted by U.S. mediator George Mitchell, correctly noting that “the agreement will be a package deal in which there are trade-offs,” and therefore, the various final-status issues “cannot be negotiated separately.” Additionally, he warned, Israel must be convinced that any deal will end with the Palestinians’ recognizing it as “the nation-state of the Jewish people” (to bridge the gap between the PA’s unwillingness to concede this upfront and Israel’s need to know it will happen eventually, he proposed having the Palestinians give such a pledge to Washington as a “deposit”).

But here’s the clincher: “All of Israel’s security concerns must be addressed by the Palestinians (and the American team) with the utmost sincerity. There will be no agreement unless Israel feels its security needs will be met.”

That, however, is precisely what team Obama has just shown itself incapable of doing. Because if you want to convince Israelis that their security concerns will be addressed, offering lame excuses for anti-Israel terror rather than forthrightly condemning it isn’t a good way to start.