Maybe the Palestinians themselves devalue their own lives compared to Israeli lives. Just look at when they agreed to a ceasefire and traded hostages for prisoners: each hostage was worth multiple prisoners released by Israel.
This is also noticeable when Hamas use their own population as human shields, exemplified by when they hide their soldiers and weapons in hospitals and schools. Or when they blend in with civilians on purpose by not using any combatant uniform like the IDF do. They really don't care for their own civilians. These are only useful for acting as human shields and, if they're killed or injured, strike a pose for NatGeo-style photos in their attempts to appeal to western sentiment.