Many of us here know that there are some people who will never admit there is hard evidence of conspiracy, no matter how powerful and clear the evidence is. They simply will not admit it because they are, for whatever reason, absolutely determined to accept the lone-gunman theory. Even after the irrefutable proof that has emerged that the autopsy skull x-rays were altered, there are still researchers, including some multiple-gunmen theorists, who refuse to acknowledge it.
To any open-minded, reasonable person, the HSCA acoustical evidence is clear, compelling evidence that more than one gunman was involved and that more than three shots were fired. In some ways, the acoustical evidence is the most intricate, sophisticated, and impressive evidence of conspiracy in existence. The locational correlations between the dictabelt gunshot impulse patterns and the test-firing shots are stunning. Even the NRC panel admitted that their own calculations showed that the probability that those correlations resulted from chance was only 7%.
There's an old saying: If someone is determined not to believe something, no amount of contrary evidence will change his mind.