I've got two liberal Jewish friends I sometimes discuss this with. Intellectual purpose means a lot to the two of them, more than even self-interest. The more moderate of the two does feel conflicted about this, but even the leftier one knows it's screwed up. Still, they're not going to change.
For what it's worth, I can understand it; if you see it as an integrity issue, anyone can understand it. I just think it's crazy. When we talk politics, we respect each other's beliefs because we're friends, but sometimes I pick up a little "no, you're OK, but those other guys ..."
And, in fairness, that's how I sometimes feel about them, so around and around we go. Sigh.
Who says there's any "integrity" to any of what the left and their MSM shills promotes today? It's basically a bunch of lies and fraud. No, this Jewish leftism cannot be rationalized on an intellectual basis, just like any other addiction.