I guess it's like that with the JFK and MLK assassinations. If you have to have a conspiracy theory, it will be more believable if you speculate about other involved in the conspiracy, rather than postulate another shooter.
I always wondered where an "unemployed drifter" like James Earl Ray got all that money and all those passports. I don't think that question was ever really answered.
Somehow he was getting money from somebody -- maybe not to kill King, but what else did he have to offer anybody?
James Earl Ray was a small time thief, robber and forger who had escaped from a Missouri prison in 67'.
'Drifter' was coined by conspiracy theorists, he was actually quite clever and always coming up with money making schemes.
Sirhan Sirhan confessed to the LA Police and it was recorded.
He also admitted doing it in open court saying it was in retribution for the creation of Israel.