Three things to consider. First, the Guardian has a consistent anti-Istael body bias. Second, their numbers are based on Hamas reports, because (sarcasm alert) of course a murderous bunch of terrorists are a credible source of information. Third, if Hamas would stop hiding behind and under their civilians (a war crime that turns them into legitimate, if tragic, military targets) and stop shooting their civilians when they try to flee and stop serving as human shields, the IDF would be delighted to have the casualties from their fire be 100% terrorists.