Inexpensive tools helped me build a successful career building things here in America. If we had gone isolationist in the 70s and 80s I would not have been able to build a construction business. I wouldn't own a tractor now and I wouldn't be blessed to be here discussing it on a computer built from parts and materials from almost 60 countries that was made by the most successful company in America. We have tried isolationism and trade wars. We have always lost and gone back to trading with our neighbors.
I could be a survivalist and do grow and create everything I need to survive but my quality of life will plummet and I will have to do many things I am not suited to. I would rather do what I'm good at and trade with others. The same goes for my views on a national stage.
Oh and trade prevents war. It just does.
I think your conflating a few things here. Trade, lack thereof, and total isolation. None of which are are entirely mutually exclusive.
First, tariffs do not impact the ability to trade with others. Other countries have had tariffs on US goods for decades and we still send our goods to those markets and vice versa. It always comes down to comparative advantage and economies of scale and scope. When labor is a high driving factor of cost, and you have people willing and able to work for pennies a day, no tariff or policy is going to change the profit that can be derived from that dynamic from a business bottom line.
There is always a market for cheap goods. It's no fluke that Harbor Freight is in every sizable market in every state. It makes no sense to buy an expensive tool for a one time job. That is common sense DIY usage and is unique from someone that depends on tools for a living. I think we can all agree, you get what you pay for and I'm sure those cheap tools had to be replace often. That is a business model that Harbor Freight relies upon, consumable consumption.
Trade has been happening since one cave man had more usable rocks than another caveman. The notion that trade can just stop with other countries is foolish. The idea that is lost is to have long sustaining trade. In the short term, imbalances in trade can survive. In the long run, it's an all consuming model when the trade is not fair for both parties. There will always be someone else (or another country) that will make it cheaper and with less labor cost. Then goods will come from that cost center and leave the prior supplier in the dust.
With knowing all that, it's in everyone's best interest to work towards long term trade deals where cost and labor are not entirely profit driven. Reducing barriers to trade, by both parties is in everyone's best interest. Free trade is the goal, however free trade will also lead to always going to the lowest labor center. That does not protect the 2nd lowest labor center and so on. Therefore we need agreements to sustain long term relationships.
Our current situation is not sustaining long term. The US consumer continues to get cheaper and cheaper goods, which just need replaced more often. That is a zero sum game. Neither the producer or consumer wins.