While you and I can look at this and go “Wow, that’s not logical, she’s way better than Trump”, the Democratic campaign should have had political scientists and psychologists that knew about this well-documented phenomenon. I imagine they did, and ignored it, because siding against Israel would’ve cost money.
D and R parties both need independent voters to win any election. For example, even if every D voted for a D, they would lose without independents voting for them in significant numbers. This has been a political fact for many years.
So... why did the Harris campaign target REPUBLICAN voters (instead of Ds and independents)? They wasted a lot of vital time on that ("He doesn't need to know who you voted for" etc), and they knew that they would lose if they did so.
She knew it too, Harris isn't stupid. She took a knee.