The scientific mind is very tentative, subject to revision based on new evidence because we are never so sure about our senses.
If we know our senses are failing us, the right thing for us to do is to suspend judgement.
Take Arab spring for example. What evidence do you have that revolution will improve people's lives? The Cromwellian revolution killed a lot of people and created a dictator; American revolution created the world's largest mob rule, where envy ran riot and where nobody knew his place, and severed the connection between the new world and the locomotive of the world's civilization; the French revolution exterminated the best elements of the French people; Russian and China' communist revolution inflicted severe brain damage upon themselves. Even the sudden collapse of the Evil CCCP did not make things better; it made the Russians poorer and gave the rest of the world more nukes.
If you do not see any beneficent effects of revolution, a reasonable question that follows is this: how likely a revolution will make things worse?
The Brits averted a French style revolution in the first half 1800's - thanks to Macaulay's eloquence - things did change gradually for the better.
That all human knowledge is uncertain, inexact, and partial. To this doctrine we have not found any limitation whatever.
Russell, Bertrand. Human Knowledge Its Scope and limits. New York: Simon and Schuster, 1948. 507. Print.