I think this is one of those fearful arguments that doesnt really represent reality.
In argentina we export a lot to Brasil, and one thing we export is cars. Lets suppose that Brasil takes a protective policy and then uses heavy subsidizing to make car factories and then outcompete argentinian automotors, lets say the subsidy is so large that cars in Brazil cost half in every single aspect, in every niche and ever smaller car element(something impossible to cover in reality).
Yes, the car industry in argentina is toast, but now argentinians can get cars at half the price thanks to the generosity of the brazilian taxpayer. The argentinians have become enormously wealthier by such a measure at large.
Not only that but now argentinians as a whole have half a car extra in money to spend in other services and products, which means that a bunch of other industries will grow! Argentinians would become much richer.
Lets say that Brasil loved that result (i dont know why, because they hemorraged money like hell) and repeat that with every single product argentina builds. IF every single product in argentina ,imported from brasil costed half, and it effectly replaces everything, it really means that Brasil is now giving argentina half the PBI of Argentina in subsidy. That is so unreasonable that it will never happen.
Theres another thought around this topic: that you can destroy an industry, and then increase your profits later on as a sort of monopoly power to recoupe the initial investment. IT would never happen that way: the moment prices rise up, investors would flock again to the argentinian automotive industry and take those profits away.
What is clear is that brasil would be using its tax payers to give products to other countries!