Progressives advocate for how to be an 'anti-racist' which is impact-based. It should be the same for Jews: The Nexus definition only focuses on intent. @TheIHRA definition focuses on how to be an anti-racist. If you don't wanna be a hypocrite, vie for #IHRA. It's that simple.
The fact that people rally around the Nexus definition and discard IHRA shows a willingness to ignore antisemitism's history and shapeshifting nature. And no, ignorance isn't bliss. When Elie Wiesel said "indifference begets hatred" he wasn't kidding.