Leftists, and I know a few personally, are obsessed with race.
There’s a belief that the darker your skin is, the more you are always oppressed and you are always right. Benjamin Netanyahu, for example, is white to them. So because his opponents are darker skin, Israel, by extension, is an oppressor nation.
That, and the left needs victimhood. But there are Democrats who still back Israel as an ally in the Middle East versus Hamas, a terrorist organization. But too many in their party take the opposite view so there’s going to be a conflict in the Democratic Party on Israel