It's called counterfactual reasoning actually. And of course you can make an argument for any event. But I doubt you can make a convincing one.
You are literally suggesting that it's impossible to learn from history.
Even further, if we can't speculate about the past, with everything we know now, then we can't possibly change the future. That is, you can't possibly predict if any decision will lead to a good outcome or not.
E.g we can't know if starting a war will be good. Or that you should prevent global warming.
As someone above mentioned, you can't even say that genocide is bad.
You are literally suggesting that it's impossible to learn from history.
Even further, if we can't speculate about the past, with everything we know now, then we can't possibly change the future. That is, you can't possibly predict if any decision will lead to a good outcome or not.
E.g we can't know if starting a war will be good. Or that you should prevent global warming.
As someone above mentioned, you can't even say that genocide is bad.