FCA Proposes a Merger with Renault

Tariffs are designed to raise money and/or to protect domestic manufacturing jobs from other countries who may have cost advantage due to lower labor/material cost, less regulation, and/or weaker currency. You of all people here should know this being that you had to see all auto manufacturing jobs leave Australia(much of it to Asian countries) due to low to non existent auto tariffs.

No they did not leave Australia to go to Asian Countries. It was the US owned Manufacturers wanted to shut down the Australian manufacturing behind the car companies because the exchange rates were unfavourable, not tariffs
Now they want to build up the Design and Development Cantres that these companies havein Australia to work on primarily US vehicles