If there was 10,15,20 eye witnesses saying they saw Oswald kill Tippet, the truth deniers would still twist the evidence in Oswald's favour. Bit like Trump denying Biden.Only difference is Trump will give up eventually. But like the truth deniers he will still believe he was robbed of victory.
I mean it beggar's belief that people still claim Oswald is innocent of the murder of Tippet. Suppose that's the reason ridiculous conspiracies exsist. Some people just can't accept that the're wrong.
I initially started out (back in the day) believing that Oswald was innocent but once I looked at the overwhelming evidence, some of it slightly flawed admittedly, I quickly realised I was wrong. Oswald killed 2 people that day (3 if you count his own life) JFK & Officer J.D.Tippet.