Semantics about strawmen applied to history aside it still would have added significant friction to it. Antisemitism was downright fashionable until WW2 and it could have impeded more gradual progress like the first Jewish member of parliament. It can be changed but it is significantly harder and easily can wind up judged "not worth the effort". Just look at how long it has been since the US ratified an amendment to the constitution.

This also smacks of whattabouttery and is more an argument for not codifying antisemitism in your constitution than having a constitution at all ...