That's just a personal opinion. If the majority of Muslims accept Bukhari as reliable then who are we to argue. If Bukhari gives some very unsavoury details about Mohammed then we cannot just dismiss them and say they are false and lies. Just to act as devil's advocate, say someone wrote Hitler's biography and it was read by someone who had no idea who Hitler was or that the facts in that biography such as genocide of Jews, Gypsies and Gays were accepted facts by the German people then how would you feel if that person choose not to believe these facts because they are so horrorific.
