Many voted for this
Trump believed that Obama was a secret Muslim infiltrate sent to destroy America because he's black, that's what they voted for. Racism.
The rest of it was just gravy.
These people are not necessary against tariff, they are against paying more for their stuff and having it benefit some middleman because the current government messed up badly.
I can otherwise understand how people would agree on paying more for their stuff if it allows their fellow citizens to have a job.
Very few people voted for tariffs, specifically. They voted for a promise of a return to a world where they were on top.