Your logic is astounding. What you are saying is that because 25% failed, the exam's authenticity and methods are to be questioned?
Here is the latest result for Online Pilots Exam from the DGCA website for April 2015 -
http://dgca.nic.in/result/Pilot_042015(withoral).pdf
You can search for Pass and Fail. You will get the total number of instances both terms if they occur in that document. Out of a total of 2601 entries, only 922 were Pass results. It is to be noted that we are not considering Absentees at all.
So here you have a Pass percentage of only 35%. 65% of the candidates that appeared for the exams failed. So will you now question the authenticity of the DGCA results?
The conclusion of which in your own words is- If the authorities actually believe that they have made things safer by rejecting a full 65% of experienced guys for what in reality is a very unlikely case of an illiterates, ignorants, unknowledgables, then perhaps those authorities themselves should be fired for stupidity and lack of common sense.
My point is that if people failed, then they failed. Try again next time or provide actual logical and meaningful accusations. Don't make it a fox calling the grapes sour scenario.