Why did some people find the ideas of the enlightenment disturbing?

people in the time of Enlightenment were worried the ideas that traditional authority was not always right , people  could and should make themselves better through reason. in this time saw a lot of advances in science and big changes in political in Europe and America. 

Portuguese colonization of Atlantic islands in the 1400s inaugurated an era of aggressive European expansion across the Atlantic. In the 1500s, Spain surpassed Portugal as the dominant European power. This age of exploration and the subsequent creation of an Atlantic World marked the earliest phase of globalization, in which previously isolated groups—Africans, Native Americans, and Europeans—first came into contact with each other, sometimes with disastrous results.