Why encourage defamation from throwaway accounts? Reddit, for example, has shown us a pitfall of this. People seem to want to believe the "side" of the story

Why encourage defamation from throwaway accounts? Reddit, for example, has shown us a pitfall of this. People seem to want to believe the "side" of the story they first heard, and take it up like it was the truth, sometimes almost militantly. One mitigation, in face of a prevalence of poor critical thinking, (when evidence can't stand alone), is to at least require an accuser to stake some reputation behind it. Not use a throwaway/anonymous. Related idea is the right to confront your accuser.