The nepotism claim is flawed because I too would help my own

This isn't a logical counterargument.

I'm essentially on the same page as you.

I do believe nepotism plays a larger role for certain ethnicities or sub-cultures than others. Think: the Italian mob, where loyalty to the family was everything and disloyalty often meant death. Ethnicities and cultures with especially strong in-group loyalty will naturally be more prone to nepotism. Culturally Jews do value loyalty to the in-group very highly, so it makes sense there would be more nepotism. That said, it's not a specifically "Jewish problem", as you see the same strong in-group loyalty in many other groups like the Chinese, Italians, and Indians, for example.

You're also correct that this isn't a right-wing issue. The Left -- including many progressive Jews -- hates Israel and the Jews. Leftist Jews suffer from self-loathing just like white Leftists do, and believe marxism/globalism/communism is their salvation.

This idea that there's something magical about Jewish genetics that makes them more evil than everyone else is patently absurd. People often see patterns they can't explain so they use whatever explanation makes sense to them at the moment, having no idea how little they actually know. Racism is generally just people assuming they know more than they do, and explaining patterns they see with incomplete information, often to support some incorrect bias or moral intuition that they have.

EDIT: I'd like to add that there's ultimately a lot more going on here than the topics of IQ and nepotism. People also have an attribution bias when thinking in terms of groups rather than individuals, as well as the in-group versus out-group.

People are more likely to be racist because when a member of the out-group does something bad, they attribute it to the entire out-group compared to when someone in the in-group does something bad, they attribute it to the individual. The reverse happens when someone does something good.

There's also this pattern recognition bias that occurs when someone sees a pattern, they tend latch onto it and become blind to other patterns that might exist in parallel. For example, looking at a bunch of chickens with varying colors, someone might notice all the black chickens and wonder why there are so many black chickens, becoming temporarily blind to the fact that there are just as many red chickens in the group.

Human nature is a mess and most people don't have the wisdom or self-awareness to recognize when they're making these mistakes.

You should read the comments underneath, some good explanations that try to get past the numerology argument JP makes