The Ibo culture welcomed the white newcomers when they arrived in the villages.  When the white men began convincing the villagers to convert to Christianity, Okonkwo challenged the Ibo decision to have let the missionaries into the village in the first place and blamed the Ibo culture for the outcome.  Personally, I do believe that the Ibo citizens played a major role in the problems that arose within the community, for they knew that the white men had killed an entire village of people in the past.  Yet they had welcomed the white men into the village, causing a decent portion of their village to convert making the village weaker as a whole.