Okonkwo killing himself does not fit his character. He had always been a fighter who could get through any situation. Killing yourself is an escape from what had to be done and Okonkwo never showed any desire to get out of work.
Obierika asks the white men to take Okonkwo down because it is an abomination for them to touch the evil body.
Obrikia takes anger out on the District Commissioner, blaming him for Okonkwo’s death. He is just looking for someone else to put the blame on to.
A comment is made about how this would make an interesting story and it’s written in a story.