Also important to note that the TRPF is largely about new machinery. Competition involves increasing technology, which raises the mass of commodities and usually the mass of profits, but lowers the rate of profit. This is only fought by further raising the mass of profits via expansion, which is why we get imperialism as capitalism grows.
Why should Western profits be protected?
Because the billionaires who get them want that to continue.
Of course if they are willing to share then there is no need. But the world doesn't look like being run by sharing individuals.