The link was/is to an article that debunks your erroneous interpretation of Luke 22:36.
The Catechism does affirm the right to self-defense  -- but it does not claim that Jesus advocated violence -- because he didn't.  In the New Testament era, and for roughly three centuries into the Christian era, Christians eschewed violence.  Over the centuries, Christians have wrestled with the problem of violence; but it is blasphemous to claim that Jesus approved it.