What can we infer is the purpose of the film, The Conversation?

The Conversation, in some ways, is a warning against the power of technology. When things begin to get out of hand, Harry is unable to put a stop to events already set in motion. Harry has taped a conversation by invading the privacy of two people walking in a crowded square in order to make a large sum of money.

Harry learns that invading another's privacy not only makes a living, but it can also destroy a life. Harry becomes obsessed with trying to figure out the meaning of the cryptic conversations, and although he wants to undo the wrong he's done, he has no recourse but to give in. In the end, he understands the feelings of others when his own privacy is invaded.