The person you're replying to said nothing about believing it, that's an inference you've made. Cos they have made a good point, listening to one side only does cause an echo chamber effect. And I encourage everyone to read as much as they can from all aspects in matters like this, but draw your own conclusions. War isn't simple, it's complex, dirty, and downright deplorable. It's why so much study into past wars is undertaken, even those in recent memory that were well documented compared to ones that happened long ago. A lot can be learnt, be it statistically, economically, culturally etc.