I think this is a bit reductionist, to be fair. For example, you are backing Palestine, despite that their democratically elected government (one of them) do terrorist attacks in Israel.I meant more generally speaking. On this topic, we do appear to have similar views, I could never back a country that is committing genocide or apartheid. I can't quite wrap my head around the idea that others can.
For what is worth, I do not back Israel in what is doing in Gaza. I wouldn't call genocide there, cause I think the threshold for it is higher, but it definitely with each day passing is looking that is going towards genocide, and even in the mild case, they are doing some horrific war crimes. And I definitely think that Israel is an apartheid state, I have said it many times here even before the war in Gaza, I think many Israel people admit it including high-ranking politicians (Barak for example).
But at the end, I understand that it is an extremely complex situation, I understand the situation in the Middle East and that there are not many good sides there (look at war crimes in Syria from all sides, including moderate ones like Turkey who bombs Kurds for fun, or Yemen), and it is an immensely complex situation with no clear solution. And Israel is an ally.
I would have said the same for many other states, the US did more atrocities than Israel ever did, in their Vietnam (and by extension Cambodia) war, the US and the UK kinda destroyed Iraq for no good reason, and still I really like the US and chose to live in the UK despite not being British. In grand scheme of things, I think that the Western countries are the lesser evil. Of course, this means feck all if you find yourself in the opposite side of them, as Palestinians are.