Free trade benefits all people. Yes there are those who also lose a bit for it too but overall it benefits all it touches either directly or indirectly.
It brings the standard of living up in export countries, lower costs in import countries, and stimulates other countries to get into the act.
Not all industries are viable long term. Just like milk delivery faded in many areas so will some textile jobs. There are plenty of examples of widgets being made in the US alone from companies very young. It all comes down to this, do you look only for the negative?
I do know one thing is true. Any candidate campaigning on trade sanctions or the like is a loser and will make us losers too