I guess it depends on what concepts you are willing to let go of. If you think Jews have some kind of holy right to land occupied by other people, yes, things are goig to be complicated because you also want to protect your ability to think of yourself as a good person, and that precludes you from supporting ethnic cleansing and genocide

If, on the other hand, you see Israel as a settler-colonial project no morally different than the Dutch in South Africa or the British in North America or the Spanish is South America or the Belgians in the Congo, it becomes a much easier ethical calculus.

There are plenty of Jews who view Israel as the latter, and the fact an identity "makes things complicated," points to self-interested decision. Just like being white makes the concept of removing barriers to employment by black people "complicated", or being a man might make supporting female rape victims "complicated." The fact that a choice might not benefit a group you identify with is not an argument in favor.

And, yeah, nobody should listen to "as a mischling jew." That's 1/4th Jewish.