Thanks for sharing. I enjoyed both poems but remain partial to Brodsky's- probably a matter of taste and preference.
However, your conclusion (or at least the way I interpreted it) that the essence that drove the writing of Herbert's poem was also responsible for Polish political outcomes and Russia's current state seems a bit far-fetched and reductionist. And Brodsky's poem and quotes in the article do not imply a lack of courage/defiance to me. On the contrary, I read his poem to mean that despite being steadfast in your views, have room for gratitude.