Conventional Applications
The techniques that we use in conjunction with Kyusho, many people don't want to invest the time to research or even practice and therefore do not believe. As they have never put the time in to study or experience Kyusho, it of course seems to be a myth.
As many comments from those folks come in to question or condemn Kyusho, when asked the question of how long they have been training it, they admit that they don't such training. They further state many times that they do not train it because they think it is false. So basically they will never know for sure, but it is not for everyone to know, just those constantly seeking to increase their knowledge, skill and potential in whatever art they practice.
Those that don't believe, should take a closer look at the presented technique in relation to the bodies vital targets (Strip the Kyusho word out and look at the anatomy and functions affected). As an example the throat as an example, everyone understands the Blood Choke on the Carotid Arteries or Sinuses, when you apply pressures or concuss these targets, physical dysfunction occurs. They are of course dangerous and why the technique was adopted widely. So if you believe a rear naked choke for example using a broad tool such as the forearm and upper arm used against these targets, then you should also understand that gripping of those same structures, with more focused force (of the fingers), could cause the same results, knockout or more severe damage, like cessation of breath or worse.