I really hate this take because it implicitly ignores the baseline murderous-ness of the systems and situations these leaders inherit. Nelson Mandela wasn't gonna rise to the top of the pile in 1920s Russia.
Furthermore, the people who underpin various states and societies (and the cultures and movements that shape them) do ultimately choose who rules them. Leaders only have freedom of action within the window of what their political capitol affords them. The people, or even just the ones that call the shots (this should be a familiar concept if you've ever seen a TV show centered around a medieval royal family) very much do set that window. Grant and Eisenhower's "failure" to thoroughly exploit conquered territory would have made them unsuitable for further leadership in antiquity for that matter yet they were both more or less instantly elevated by the existing power structure and elected to the highest office.
This is a bad take because it comes from linguistic ignorance. The "great" here doesn't mean the person is wonderful with a kind soul and a benevolent impact. It's not "great" as an extra intense "good".
It's great like a Great White Shark is great. Great like Great Britain is great. Large, impactful, encompassing. A person is said to be a "Great Person" if they are seen to have a disproportionately large impact on the course of history. It is this premise, of some individuals being able to have such disproportionate impacts (rather than everything being a product of the times) that certain philosophers and historians have objected to. It wasn't out of concern that we might be glorifying nasty people with the term; if that were it then we could simply change the terminology to "Impactful People" or something like that. Those who've lodged serious objections to the premise of great people would not be placated by this change in words.
Furthermore, the people who underpin various states and societies (and the cultures and movements that shape them) do ultimately choose who rules them. Leaders only have freedom of action within the window of what their political capitol affords them. The people, or even just the ones that call the shots (this should be a familiar concept if you've ever seen a TV show centered around a medieval royal family) very much do set that window. Grant and Eisenhower's "failure" to thoroughly exploit conquered territory would have made them unsuitable for further leadership in antiquity for that matter yet they were both more or less instantly elevated by the existing power structure and elected to the highest office.