Why do sociologists consider the "scientific" racial types of Caucasian, Mongoloid, and Negroid to be misleading and even harmful?

Here are several reasons for that:

- Every society's population contains a lot of genetic mixture,

- Various racial categories are genetically very much alike,

- The skin color of Caucasian people ranges from very light to very dark.

Explanation:

The fact that there are a large number of similarities between people form different races and varieties between people from same race indicates that there are very little difference between races. (approximately, people form different races only has around 6% of genetic difference)

From the social perspective, differentiating and the racial difference tend to lead to tribalism that make groups of a certain race believe that the others are inferior compared to them. This will increase the risk of conflicts.