People don't seem really interesting in defending it, probably because they aren't coming at this issue from a place of logic; they're just mad Trump won and are trying to minimize their personal discomfort, and because there isn't really much you can argue from a pro-Biden/Harris position that has hard evidence behind it, we're stuck speculating on what might have happened based on Harris's public statements, which, to put it generously, were all over the place.

The most favorable argument I could see is that Bibi was probably deliberately preventing an agreement from being reached because he knew that it would hurt Biden with his base and Israel overwhelmingly wanted a Trump presidency. Any attempt to play hardball would've won him the ire of AIPAC and could've hurt Harris in eastern PA (hence also "fracking fracking fracking"). Stopping arms shipments might also be interpreted as a signal of weakness by Iran and Yemen and who knows what would happen then.

You could probably identify a lot of issues with this argument and I'm probably not the best one to make it, but from a personal perspective this is the best one I've seen: the Harris campaign was in a double bind and they gambled on trying up the center to convince Netanyahu that Harris was the friendliest face he was going to get and he needed to get a deal done before there were consequences.