It is not for the west to believe, it is for their home audience. If a dirty bomb made out of zaporizia goes off nato countries will get involved to help.clean up and control the plant and assist humanitarian efforts. Russia gov then still gets to play victim to its domestic audience blaming it all on other side. And some may be patriotic and want to believe and others will have to engage in doublethink and 'have' to believe it or be re-educated.