The other option is that they simultaneously believe they need your vote, but also know that they would lose more voters than they would gain if they did what you’re asking. It’s not entirely clear that this is what’s happening, as there’s not been much indication that Kamala believes what Israel is doing is horrific, but it’s a very real possibility that you aren’t including. And in that case, voting for her remains the best you can do, since you not voting for her won’t convince the other people who’s vote she would lose. It will just lead to trump being elected.
The other option is that they simultaneously believe they need your vote, but also know that they would lose more voters than they would gain if they did what you’re asking. It’s not entirely clear that this is what’s happening, as there’s not been much indication that Kamala believes what Israel is doing is horrific, but it’s a very real possibility that you aren’t including. And in that case, voting for her remains the best you can do, since you not voting for her won’t convince the other people who’s vote she would lose. It will just lead to trump being elected.