But this graphic, like a lot of statistical graphics, doesn't tell the whole story. It's easy to look at the numbers and think Israel is clearly the more barbaric entity.
Gaza is incredibly densely populated, densely constructed, and that alone is going to lead to massive collateral injury and death when you bomb such a place. On top of that, when the military targets you're aiming for are deliberately hidden behind the general population that only increases the chances. In reverse, when Israel is targeted it is generally these shitty firework type missiles aiming at largely open areas with pockets of urban development, so the injuries and deaths are far less, and now that they have 'Iron Dome' (and probably soon a laser defence) that figure will continue to decline.