It is important to understand the distinction between activists, organizers, and political hobbyists. Hobbyists often have very strict political standards around respectability or radicalism, to which few activists ever seem to rise. If you organize anything political, you are likely to attract the criticism of hobbyists, since for some people, critique is a pastime. Of course, organizers make genuine mistakes that political hobbyists may react to, but the fact is, making mistakes is a consequence of trying.
