I'd amend that to say "Fact checkers *can* be a tool to silence the voices they don't like".
The tool I built enables people to check a statement against the knowledge of Google Search and then decide for themselves.
Is Google Search 100% accurate? No, it's based on information from people, and people lie, manipulate, fudge and deceive. Information changes, facts change.
But I believe that it's a better alternative than blindly accepting or rejecting everything that you read.