Are you saying this war has a higher civilian casualty ratio that other wars? Sadly history shows that civilians have been casualties of war at high rates compared to combatants.
Part of the trouble is Israel can't prove the 12,000, and no one actually believes the Hamas figures are legitimate. But there are not better figures available for either number. So 1:1 for Gaza is the best we can estimate.
The wikipedia article should be read as a starting point in understanding how extremely unreliable those numbers are, and how much it depend on how people define combatant and civilian.
So, as horrific as this war has been, I don't think the claim that this is "one of the the deadliest wars for civilians in general" holds up.