Truckers are all for automation at the port, as it makes their job better as there will be fewer queues and delays in loading their cargo. Their job security is not affected and they can deliver quicker.
Port workers are against automation, as it replaces their job descriptions.
Many of the port workers are also unionised and have more influence over the politicians and port authority. Truckers and immigrant port workers are not unionised and less effective at being heard.
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Luddites will always resist technological improvements that reduce their job security. Everyone else will be for it as it improves their interaction with whatever that job delivers.