Three Reasons Why a Double Standard is Imposed on Israel

It's actually four.

Because they were seen for nearly two centuries as a punching bag for European Christianity.

Then Europeans got sanctimonious when Jews re-established Israel and thus were no longer beholden to European permission.

There are so many Muslims that Europeans get scared of the idea of siding with Israel against Muslims - never mind the rampant corruption and bloodletting of Muslim cultures.

Europeans still harbor an inner refusal to be fully accountable for the Holocaust. Germany willed and created it and was aided and abetted by Eastern European nations and also occupied France; nations like Switzerland and Sweden, though ostensibly neutral, turned their back; even the US refused to shelter Jewish refugees - yet antisemitism in the US is rare.