I think that a big reason for placing the trade tariffs on China came from fear that if China was allowed to experience economic growth any further, they would be able to dictate the economic prosperity of the United States. As of now, our economies are greatly intertwined (more so two years ago) but less so as we progress into the future with the tariffs in place. Ending the trade relations strategy with China that was established and nurtured over the past decades effectively stops China short of growing their economy to the same size of the United States. This ensures the United States remains the largest economy in the world [0] and in turn lets the United States retain its control over the global market. With this in mind, I find it hard to believe that the United States is making the trade tariff decisions with small or big businesses in mind, and is instead focusing on its future positioning within the global market. This might look like isolationism from the outside but in act, it's the United States pulling out of the market it was most heavily reliant on, it an attempt to slow down it's economic growth.
[0]https://www.investopedia.com/insights/worlds-top-economies/