Many people who support Israel have been asking for decades: "Why...."? when they hear the left supporting Iran, Hamas, Hezbollah and the rest of fascist states or groups.
From Obama to Biden to those on the streets of the West yelling for the destruction of Israel, Leftists seem to be supporting those people that hate it and wish evil on it.
These good people give many reasons for this phenomenon: Ignorance, Money (Bribes), the wish to get attention, the need to get elected.
But there may be another reason. Like they say - sometimes the simplest answer is the correct answer.
The Leftist Utopia - A Palestinian State.
The Left seems so focused on creating a Palestinian state that they cannot think of anything else without this being their reality.
Everything that happens in the world, or at least, the Middle East, is colored in one question: "Will this help to force Israel to agree to a Palestinian state?"
This state, by the "moderates" (Obama, Biden, the US state department) want to see Israel next to a Palestinian state. The more extreme want to see a Palestinian state INSTEAD of Israel.
Both believe that once there is a Palestinian state, Hamas,PLO, PIJ and the rest of them; Iran, ISIS, Al Qaeda,Boko Haram - all of those so-called "extremists" will just disappear since their reason for being there is the same as the State Department: To build a Palestinian state.
Iran attacks Israel? The UK Guardian, which tries to be the English New York Times, but a bit farther Left, colors their headline about the attack, but colored by the Palestinian issue:
‘Sympathy shifted to Israel’: many fear Iran attack has distracted aid effort
Why would you put these two issues in one headline? Because they are focused on ONE issue - the Palestinian State.
Why does Obama and Biden keep propping up Iran - because they believe that an extreme Iran will pressure Israel to accept a Palestinian state.
And NOT just Biden and Obama - many Israelis believe the same thing! They go to bed and wake up in the morning doing all they can to build a Palestinian state.