I believe the answer is: Some social patterns are harmful to certain groups of people.
Socially conflict theorist operate on the basic belief that people in a society would always be engaged in conflict due to the competition to obtain limited resources. During the process, some group of people would be trapped in a social pattern that might prevent them from advancing in society.
Example of the pattern :
Being a single mother -> had little time to both taking care of kids and work at the same time -> The children become neglected -> The children engaged in risky behaviours without the parent noticing -> the children got pregnant in their teenage years and the cycle continues.