WARSAW, Poland—Jaroslaw Kurski and Piotr Stasinski embody the hope that once was Poland. They struggled against the Communist regime for years in the underground press and as Solidaritymembers. They built Gazeta Wyborcza, now one of the most influential newspapers in the country, after the 1989 fall of communism. They helped usher in a period of democracy and open debate, one that …