You obviously don't understand my comment at all. If Wikipedia has proof then there isn't any longer "a particular position", but a fact that can and should be stated. Wikipedia writes "Lee Harvey Oswald (October 18, 1939 – November 24, 1963) was, according to four government investigations,[citation needed][n 1] the sniper who assassinated John F. Kennedy". Note the "according to" and "citation needed". But it also writes "On November 24, 1963, Ruby shot and killed Lee Harvey Oswald". No "according to" and no citations.