What genre focuses on a worse-case scenario in society?

Most likely technology since society cant live without it anymore. but, im pretty sure thats not the right answer to the question you want, do you mean globally? like polarbear, extinction (etc) ?

Often times, the dystopian genre focuses on worst-case scenario in society.

Dystopian stories often take place in real or fictional worlds in which societal situations are difficult. Some examples may include poverty or an enormous disaster. The dystopian genre primarily uses difficult living situations to build characters and express a strong theme in which some degree of suffering is necessary.