Here's why:
* Link Deas is a friend of Tom Robinson and his family. He is a kind and just man who stands up for what he believes in. However, he is not a writer and doesn't express his opinions through editorials.
* Atticus Finch, as a lawyer and respected member of the community, is the one who writes the editorial. He does so out of grief and anger over Tom Robinson's wrongful death, calling out the town's hypocrisy and prejudice.
Let me know if you have any other questions about "To Kill a Mockingbird."