I really wouldn't say that on numerous grounds. First off, many of the "Enlightened Despots" were war-mongers - most famously Frederick the Great. Not only that, the Enlightenment and "humanist" values actually helped usher in the age of total warfare. We especially first saw this with the levée en masse that occured during the French Revolutionary Wars. As the National Convention famously proclaimed in 1793:
Originally Posted by Alwar
From this moment until such time as its enemies shall have been driven from the soil of the Republic, all Frenchmen are in permanent requisition for the services of the armies. The young men shall fight; the married men shall forge arms and transport provisions; the women shall make tents and clothes and shall serve in the hospitals; the children shall turn linen into lint; the old men shall betake themselves to the public squares in order to arouse the courage of the warriors and preach hatred of kings and the unity of the Republic.This level was mass moblization for warfare was simply unthinkable with previous systems of governance; and went into overdrive as the Industrial Revolution advanced further - culminating with World War I and World War II.