There are so many differences between the trucking industry and the airline industry. Comparing the two is disingenuous at best. There is a reason why the airline industry -- even in Indonesia -- is much safer than alternate forms of transportation.
To foster safety, in most jurisdictions an aircraft accident is investigated by a Transportation Safety Board -- not by the police. Part of the reason is to encourage free flow of information.
A pilot should be free to talk to the Safety Board about the accident so lessons can be learned and improvements to safety can be made.
Otherwise, all pilots must completely "lawyer up" after every accident, since anything a pilot says can and will be used against him in a criminal court. The pilot cannot trust that the investigator will not try to trap him into making criminally incriminating statements.
Hence it is for the good of society that pilots are shielded from criminal liability when they make mistakes. We trade-off jailing some pilots for the safe travel of millions of passengers each year. Which would you rather have?
This does not mean that pilots are completely "immune" to criminal liability. But the standard for charging must be very high -- beyond simple or even gross negligence. E.g., if a pilot was high on drugs and caused a fatal accident, then that pilot should be convicted in criminal court.