Humans can sift through sigint (Cell phone calls, text messages, network access, etc.) to identify and locate targets. This is labour intensive and prone to error, but it can be done. In the past, such efforts were reserved only for high ranking members of Hamas and, if civilians were killed in the process, the IDF accepted that because of the potential rewards. Note that civilians dying is usually part of the plan in such operations. The "Where's daddy?" tool is designed specifically to identify when targets are in their homes with their families so that they can be bombed along with their families.
Lavender has allowed the IDF to perform the same kind of identification/location for anyone even peripherally involved with Hamas. The IDF has admitted to accepting casualty ratios of 20:1 (civilians to Hamas), and the real ratio is probably higher. If the AI fingers somebody, they're Hamas unless extraordinary evidence proves otherwise. Instead of scrutinizing what comes out of Lavendar, the IDF has shut journalists out of Gaza to reduce the odds of extraordinary evidence ever coming to public light.
The real problem here is not that Lavendar makes mistakes. Humans doing the same job would too. The problem is that the IDF has so completely dehumanized Palestinians that, without questioning their digital oracle, they are willing to drop bombs on large numbers of civilians if there's a chance, according to Lavender, one of them might be involved with Hamas in some way. That's not an AI disaster. That's a human disaster.