angrysoba
Philosophile
And mental illness rates are actually increasing.
So are the numbers of conspiracy theories and conspiracy theorists.
A coincidence? I think not!
Anyway, there almost certainly are good sociological reasons for believing that lone nuts could be more prevelant now than "before 1750". One of those, ironically, is education.
Uneducated people living in squalor made up the mass of those who were not on the inside until comparatively recently. There were simply fewer revolutionary ideas that motivated a lot of lone nuts such as nationalism, communism, anarchism, conspiracism. When people were assassinated in ancient times it was because they wanted to seize power themselves and would more likely succeed with the backing of their own faction. Many of these were necessarily insiders too. There weren't people assassinating others over their difference in opinion in ideology (that came far later) and most personal disputes that led to assassinations were by insiders. Gallileo's parameters for "lone nut" essentially disqualifies almost all people living pre-1750 while there are vastly increased numbers of lone nut candidates today.