One might have to make value judgments, insist on civilized behavior and undertake to understand and (shudder) respect religious arguments.
The left is congenitally uncomfortable with religion in Western societies. And, in their racist way, will forgive the Muslims their exotic ways. If the question of Israel forces them to deal in religious questions and morality issues, it's easier to take a Ball Four and go anti-semitic.
It's the nature of liberals to play fast and loose with other people's money. And, now, they're playing fast and loose with other people's country.