Trivilising and overusing words is a very serious issue indeed, especially when they are very serious like “holocaust” or “racist” or “offense” or “traumatic” or whatever other important term you can think of that gets viral and gets tossed around like candy. In this case though…
… this topic seems to be managing to trivialise a normal everyday word/concept like complicated/complex. That’s very impressive. 
Talking about conflicts that span centuries or speaking about tens of thousands of dead people or relocating millions of civillians in terms of “not complex/complicated” is quite callous and wrong on so many levels that I think that you should all re-examine the use of that word in this context.
Unfortunately sometimes I wonder if it is so. In this topic the numbers of dead people are used casually just like a sports statistic and people are trying to discuss who is the GOAT of killing, as if the discussion is “Michael Jordan or LeBron James?”
I had a discussion recently with a very educated person (he holds a degree relevant to international diplomacy) about a local diplomatic conflict and the Prespa agreement of 2018 which is quite recent, but its context goes back for decades/centuries. I’ve noticed that even if the events are very recent, even very educated people will tend to have “selective memory” (to be mild about it) and tend to paint the facts with their own ideologicopolitical brush to post-facto excuse/explain events and actions made by the faction they support.
Have you listened to a radio coverage of a match while watching the same game on TV? The radio coverage is so wildly innaccurate (because they have to make it exciting) that you start wondering if you and the radio announcer is watching the same game. This is a good analogy with history. Even if you lived through a period of time, when you listen to people talk about it a few years later you start to wonder “where we all in the same time and place or are these people talking about a different country?” 
Historical knowledge is supposed to be used as a warning and a study of the past to avoid the same mistakes. But is this how we use it?