According to the Al-Jazeera Gaza Twitterbot, Hamas is reporting that 48 of its fighters were killed in the Gaza bombings and the subsequent invasion.
According to Gaza Body Count, 1203 dead have been confirmed so far. Those 1203 are 98,93 % of the casualties, with the remaining 1.07 % - 13 dead - on the Israeli side.
If that's true, then 3.99 %, almost 4 % of those killed on the Palestinian side were legitimate targets. The remaining 96 % were innocent bystanders.
Or, well, "bystanders" is maybe the wrong word, seeing as how they were locked inside a territory they couldn't escape from. Maybe "terror victims" or "murder victims" are a better phrase.
Whatever we call them, I believe that percentage is far higher than most wars in the 20th century. I have top people getting the numbers now. In the meantime, let's suffice to say that there is no way that this can be adequately described as a war on Hamas aggression. Reading purely from the numbers, this was a war on Palestinian civilians which happened to hit some Hamas fighters. I'm sure you could pretty much carpet bomb Gaza and get the same percentage. I wonder if they were even aiming.
Update: My top people. Well... Mikkel, actually, has gotten hold of the numbers. They're in comments.