What is a primary reason carriers are warned against throwing bundles of newspapers from trains?

The primary reason carriers are warned against throwing bundles of newspapers from trains is to prevent injury to passengers. When newspapers are thrown from moving trains, there is a significant risk that they could hit individuals nearby, such as passengers waiting on platforms or workers near the tracks. This practice could lead to serious injuries and creates a dangerous situation that is taken very seriously in train operations. Safety protocols are focused on ensuring the well-being of both passengers and employees, which is why preventing injuries takes precedence in the context of newspaper handling.