Why is tone so important in an argument

Answer: Whatever the content of the things we say, it's our tone that communicates what we're feeling when we say them. Our tone tells the truth even when our words don't, even when we're unaware of that truth ourselves. And it's our tone to which others respond. We can even say "I love you" in a way that provokes bitterness and then innocently argue we're being unfairly attacked when the person to whom we've said it quite rightly responds to our tone rather than our words.

Explanation:

A writer's tone is very important, as it conveys a particular message from you as the writer and likewise affects the reader in a particular way. Consequently, it can also affect how the reader receives the message you are communicating.