What to say , I can say just they are good busines...

What to say , I can say just they are good businessman. My mom and dad was on December 11th. They got refused, the lady from there asked just: What you want to do in USA?, really? What a stupid question, to ask 2 old persons of 70 years what to do in USA. My parents said : to meet Christmas with my son and his family. She refused without an answer.
Some of people told me that who is working there , they are good psychologist, hell no they are good businessman. In 30 minutes my parents said that 15 people was refused, and no one passed. So just here is 2400$ they earned.
What priorities they follow to get that visa?
Why people spend a lot of money for nothing?
Why they are not saying if you don t have ( doc A, B , C etc..) do not apply?
Whatever, or with new ambassador or with old one is the same..