I believe the Left has been wrong on virtually every great moral issue in the last 30 years.
During that period, it was wrong on the Cold War -- it devoted far more energy to fighting anti-communism than to fighting communism.
It was wrong for attacking Israel for its destruction of Saddam Hussein's nuclear reactor.
It was wrong on welfare.
It was wrong in its demanding less morally and intellectually from black Americans than from all other Americans.
It was wrong in advocating bilingual education for children of immigrants.
It was wrong in generally holding American society rather than violent criminals responsible for violent crime.
It was wrong in imposing its view on abortion on America through the courts rather than through the democratic process.
It was wrong in teaching a generation of men and women that men and women differ because of socialization not because of innate sex differences.
It was wrong in reducing sex to a purely biological and health issue for a generation of young Americans.
It was wrong in identifying "flag waving" with fascism.
It was wrong in supporting the teachers' unions rather than students and educational reform.
It was wrong in allying itself with trial lawyers and blocking tort reform.
It was wrong in blocking the military from recruiting on campuses and teaching a generation of young Americans that "war is not the answer" when war is at times the one moral answer.
It was wrong in arguing that America is not based on Judeo-Christian values, but on secular ones like Western Europe.
It was wrong in advancing multiculturalism, which is an extreme form of moral relativism that holds all cultures morally identical and which is a doctrine designed to undermine American national identity.
In just about every instance, one could say that the Left was foolish, the Left was naive, the Left was wrong, even that the Left was dangerous. But in all of those cases, one could imagine a decent person holding any or even all of these positions.
But we now have a bright line that divides the decent -- albeit usually wrong -- Left from the indecent Left.
The Left's anti-Israel positions until now were based, at least in theory, on its opposition to Israeli occupation of Arab land and its belief in the "cycle of violence" between Israel and its enemies. However, this time there is no occupied land involved and the violence is not a cycle with its implied lack of a beginning. There is a clear aggressor -- a terror organization devoted to Islamicizing the Middle East and annihilating Israel -- and no occupation.
Dennis Prager is a SRN radio show host, contributing columnist for Townhall.com and author of his newest book, “The Ten Commandments: Still the Best Moral Code.”