What is the main reason a speaker might use exclusive language

The main reason why a speaker might use exclusive language is to highlight differences between opposing sides.

Explanation:

Exclusive language as the name says excludes, creates a difference between groups of people and generalizes things that are similar, showing them as an opposite of the ones that are not, at the same time, it creates the feeling that these opposites cannot be mixed in any way since their differences are so big and selective that it would be too hard.

chapter i -- paris: september, 1792

a surging, seething, murmuring crowd of beings that are human only in name, for to the eye and ear they seem naught but savage creatures, animated by vile passions and by the lust of vengeance and of hate.

during the greater part of the day the guillotine had been kept busy at its ghastly work: all that france had boasted of in the past centuries, of ancient names, and blue blood, had paid toll to her desire for liberty and for fraternity.

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