I'm not absolving BN or any in his administration of blame or suggesting that Israel simply follows orders. The actions in the occupied territories and Lebanon are entirely down to Israel but they are being assisted by the UK, the USA and others and by continuing to supply arms and giving diplomatic cover, the West is enabling the genocide.
On specifics, Israel and the Israeli lobby are the drivers and Zionism is the engine but, like I think you're saying, Zionism is an extention of white supremacy which is evidenced by the cheerleading of fascists around the world.
The hymn the West is singing is an anthem of empire as it sees it's half millenia of colonialism disappear down the toilet.