The requirement for an ATP certificate has to do with the regulations under which the aircraft is operated as well as the aircraft itself. As a matter of fact, you don't necessarily need an ATP to operate a jet. Part 135.243 says "No certificate holder may use a person, nor may any person serve, as pilot in command in PASSENGER-CARRYING OPERATIONS- (1) of a turbojet airplane, ... In other words, you could fly that EA500 as a commercial pilot with the appropriate type rating hauling cargo. Later in the same paragraph you would have to have an ATP to fly a Baron in Part 119 Commuter operations.

There are other regulations that allow other things. Be careful about inferring that your fellow pilots are idiots because you think the regs are really so simple. By the way, Joe, your english is horrible. Either that or you were drunk when you posted. Go read your post.