You have to be careful while studying Gustave Le Bon and his works. He was a product of his times and so there is an undercurrent of racism in this book due his being influenced by pseudo-scientific "Social Darwinism" theories - https://en.wikipedia.org/wiki/Social_Darwinism
Approach it as just a sociological/psychological case study of the 1800s and there is much to learn.
Book overview and excerpts - https://en.wikipedia.org/wiki/The_Crowd:_A_Study_of_the_Popu...