Why am I so optimistic about the steel industry?

It is normal for different people to have different views on steel, a traditional basic raw material industry. Some people think that steel is still the basic raw material and irreplaceable strategic material of industry, an industry with basic industrial nature, a symbol of a powerful country, and a symbol of an industrial power that money can't buy. Some people think that the steel industry is a polluting industry and there is no need to develop it. It is better to buy steel than to need steel, and there is no need to build a steel plant and pay environmental costs. Others believe that the steel industry was once brilliant, and now the yellow flowers are about to wither and the dusk is about to pass. This is a sunset industry, and there will be no chance of breakthrough. There are also people who eat melons who think that iron and steel industrial countries do not advocate development. It is better to invest in electronics, new energy, automobile and equipment manufacturing, tourism, service industry, finance and other tertiary industries to achieve smokeless output value. Trump confirmed that the strength of the United States once again can not be separated from the return of manufacturing industry, but also from the ability of the United States to make steel, thus imposing tariffs on imported steel and improving the competitiveness of the US steel industry. Let's see whose point of view is better.