

I think you’re way overestimating the consistency of independents in the US when it comes to Israel. See recent Gallup figures from February. It’s only in the last year that net sentiment seems to cut against support for Israel.
This is a consistent annoyance. Disaffected voters recognize that neither dominant party represents them, see that others feel the same way, and then seemingly assume that the other disaffecteds share their opinion on x or y. If only the party would align with me on this topic, they’d bring over all the independents! It’s not that simple of an equation for many issues.
This isn’t to say Democrats to a good job at triangulating public will or building a coalition. They do not.
These ratios hold pretty true with regards to competency in the workplace, too.