ONE wonders how you 'picked' up this opinion, SINCE there were so few copies of the Warren Report published hence it's HIGHLY UNLIKELY you have EVER even LAID eyes on this volumous work and FORMED that opinion yourself. Nowadays, it's available for access on the web, but, STILL, few read this primary document.
THE prevalence of this opinion (The 'Lie'), of course, is PARAMOUNT in every conspiracy work produced to this date.
Little does the average 'consumer' of conspiracy crapola REALIZE that the VAST amount of the WC Report is comprised of interviews from citizens, et cetra, and NOT simply one large opinion piece written by 'the govt' (as the conspiracy kooks would have THE PUBLIC believe).