Just wanted to get your take on these two.
I'm not sure this is within the thread, but my 'take' is that the 1937-39 purge was not an isolated historical example of elite restructuring in a society following a 'shock'.
Essentially this is a much larger manifistation of the trauma expereince for individuals. People deal with trauma in different ways and so do nations.
Some people deal with trauma by 'structuring' their world. They eliminate any expereince they dislike by misrepresenting its significance to themselves. They also shut out any people around them who do not fit the 'required' role or behaviour in their perception of 'safety'. Trauma victims also change behaviour to justify wants and needs. Some go into austerity mode, while others become reclusive and negligent.
Something similar happened to US as a result of Depression in the late 20s, to Germany about the same time, and to Japan in the 50s, to China following end of Imperial rule, to France in 1780s, etc., etc., etc. Most of the global states are quite trauma-laden, and have been trying to deal with it for centuries.
In many cases there is trauma upon trauma compounding the problems of development and national maturation which leads to external conflicts as much as internal conflicts.
In case of Stalin, we have a case of a personality which was probably denied positive expression in childhood, traumatised in early adulthood, and sought to deal with these by means all too well known now. As it happens Stalin was a 'case' within a 'case' on national scale.
When people 'rate' commanders, the generally fail to do detailed psychological assessment of the individuals in question to see how they became 'bad' or 'great'. Many 'great' commanders had deep-seated personality disorders and suffered from psychological trauma, not least because of their military expereince.
Even considering the everyday concept of stress, military officers expereince way and above what the average manager expereinces. In a job where a decision even if correctly made is likely to cost someone their life, the comparison of not preparing the report for a superior on time just doesn't measure up. Consider the management 'styles' of exacutives after corporate takeover. Consider the number of executives that send their busineses bankrupt or worse go to jail every day.
If commercial activity was reported in military terms the media would be reporting on a major intense combat operations with MAJOR casualty rates.
Alexander the Great is a case in point because he is usually rated as one of the greatest in history, at least of Europe.
However consider this behaviour "The Greeks regarded the gesture as the preserve of deities and believed that Alexander meant to deify himself by requiring it. This cost him much in the sympathies of many of his countrymen. Here, too, a plot against his life was revealed, and one of his officers, Philotas, was executed for treason for failing to bring the plot to his attention. Parmenion, Philotas' father, who had been charged with guarding the treasury at Ecbatana, was assassinated by command of Alexander, who feared that Parmenion might attempt to avenge his son.
Several other trials for treason followed, and many Macedonians were executed. Later on, in a drunken quarrel at Maracanda, he also killed the man who had saved his life at Granicus, Clitus the Black. Later in the Central Asian campaign, a second plot against his life, this one by his own pages, was revealed, and his official historian, Callisthenes of Olynthus (who had fallen out of favor with the king by leading the opposition to his attempt to introduce proskynesis), was implicated on what many historians regard as trumped-up charges. However, the evidence is strong that Callisthenes, the teacher of the pages, must have been the one who persuaded them to assassinate the king." Add to this the need to purue his enemies tirelessly and name cities after hiself. Consider the childhood expereince, and early maturity (in battle at 16), as well as homosexuality.