It's not uncommon for perfectly legitimate military operations in urban areas to kill more civilians than enemy soldiers. Managing to only injure a few civilians while seriously wounding hundreds of enemy soldiers in an urban area is a remarkable achievement.

Hezbollah of course is an entirely legitimate military target. They've been indiscriminately raining down missiles on northern Israel for months, forcing tens of thousands of Israeli's to abandon their homes. Israel has every right to put a stop to that, and it would have been perfectly reasonable for them to kill tens of thousands of Lebanese civilians in the process of killing the tens of thousands of Hezbollah members responsible for this.