about suppression of the Streltsy uprising:
If there is doubt [regarding his active participation], there is none on the matter of Peter's responsibility for the mass tortures and death, or on the question of his presence in the torture chambers while flesh was being flayed or burned. To us this seems brutal and degrading; to Peter it seemed necessary. He was indignant, he was angry, and he wanted to hear the truth himself. "So great a distrust of his boyars had taken possession-of the Tsar's mind," says Korb, "that he was afraid to entrust them with the smallest part of this examination, preferring rather to devise the interrogatories and to examine the accused [himself]." Besides, Peter never hesitated to be a participant in the enterprises he commanded, whether on the battlefield, on shipboard or in the torture chamber. He had decreed the interrogation and destruction of the Streltsy; he would not sit back and wait for someone to bring him news that his command had been obeyed.
Yet, Peter was not a sadist. He did not enjoy seeing people tortured—he did not, for instance, set bears on people merely to see what would happen, as Ivan the Terrible had done. He tortured for practical reasons of state: to extract information. He executed as punishment for treason. To him these were natural, traditional and even moral actions. Few of his seventeenth-century contemporaries, Russian or European, would have argued this principle. In fact, at that moment in Russian history, what counted was not the morality of Peter's act but its effect. The destruction of the Streltsy inspired in the Russian people a belief in Peter's harsh, implacable will, and proclaimed his iron determination to tolerate no opposition to his rule. Thereafter, despite his Western clothes and tastes, his people knew that they had no choice except to follow. For beneath the Western clothes beat the heart of a Muscovite tsar.
This was part of Peter's plan. He did not destroy the Streltsy simply to wreak vengeance, or to expose one specific plot, but to make an example, to terrify, to force submission. The lesson of the Streltsy, burned in blood and fire, was one from which we today recoil, but it cemented Peter's reign. It gave him the power to work his reforms and—for better or worse—to revolutionize Russian society.