Okay, this is a fair point. Yes, we're all drenched in blood, historically and recently. Hell, up until the 70s my own country was running a bona-fide eugenics program aimed at the Roma, the Sami, the mentally handicapped and ill, etc. etc. etc. All of European and American history is pretty much us butchering each other for no good reason, followed by going round the entire world and heaping atrocity on atrocity by murdering or maiming the out of the people already living there. We've traded other human beings like chattel, we've pushed drugs onto unwilling countries, we've raped and pillaged and murdered. None of us have the moral high-ground.
That being said, however, we eventually (finally) realized that what we were doing was in point of fact not only utterly counterproductive, but also morally wrong. Which is why I suspect a lot of us are going "What the holy is Israel doing" and why there's so much pushback and angry yelling in the thread right now; We already know where this comes from, where it inevitably leads, what the final act will be like, and personally, I'd rather not see it happen again, ever. The reason we know where this is going to end up if things continue as they are, is precisely because of our own histories.
For me, this isn't about being "morally superior" to any and all Israelis, it's about pointing out that the Israeli government and army are in the process of committing a series of escalating and frankly hideous crimes against the Palestinians, crimes that a not insignificant proportion of the Israeli population at least seem to support. In a sense, at least in my case ( and maybe with others in this thread, who knows ), Israel did its work too well;
If you want to blame something, blame hammering the words "never again" into us so hard that we also think it should apply to Palestinians.