Magna Carta was the result of King John altering the natural flow of how the English system worked. The unwritten Constitution, which still prevails. Over the centuries Parliament gained in power, as the power of the King receded, so that by Elizabeth I’s time, she could no longer put a member of Parliament in the Tower. They had a degree of immunity. Eventually it grew to the Glorious Revolution of 1688, when the monarchy was overthrown, and the dual monarchy of William and Mary was installed, with the rights of English people preserved in law, to some extent. A bloodless revolution. By George III’s time, Parliament had the upper hand completely. All without a bloody revolution, it advanced via the reform laws, keeping the society stable while reforming it.
The people benefitted in each instance, without having to recreate everything again and again. Stability helps families, businesses, the poor. Lenin and Stalin were no friends of the poor or backward, especially the peasants, they had no plan at all for them, they were focused entirely on industrial workers.
The French took almost a century to gain any stability after their revolution, the Russians have yet to achieve it, let alone a sense of freedom from authority. The Chinese are even worse off in terms of freedom of thought or speech, or freedom in general. The one child policy is only relatively recently gone. I am sure in your view, sterilizing, or killing an unexpected child, so long as it is good for the state, is a worth while endeavor. What matters the body count, so long as change for the better happens.
The power for change in the British system stemmed from the aristocrats. They understood that at some point enough was enough, and the people had to be attended to. The French, Russians, etc., did not, and fell. Was the chaos worth it? How many were guillotined, sent to gulags, starved to death, in the name of progress. If that is progress, even social progress, you are welcomed to it, just remember the revolution always eats its own.