Shallow understanding from people of good will is more frustrating than absolute misunderstanding from people of ill will. what is the author’s purpose for including this sentence?
a. to condemn the insincerity of his critics’ adviceb)to contrast the motivations of people in powerc)to explain the need for mutual understanding
d.to criticize people who treat others cruelly

The first alternative is correct (A).

The passage narrates the speech of a person frustrated by the indifference in the personal treatment by people of good will. The complaint consists of the superficiality or the little attention given to his/her questions. That is, it is a criticism of the shallow advice he/her receives from these people. If they went deeper into the issues, they would give clearer and more objective advice.

There you got the correction. read it well just in case. Hope this can help you