In my view tariffs are a bad thing.
What President Trump is trying to do against Canada wins him no friends. The USA is hardly seen as a role model any more by the third world, who will increasingly be attracted to China. Sadly, the Trump administration comes across as power hungry and greedy. These are not values that many in the world see as good.
Although I understand what President Trump is trying to achieve, this reminds me of King Canute trying to control the tides!!
It may encourage USA firms to make parts, e.g. for cars, in the USA, but I struggle to see how they can make them inexpensively, stoking inflation in the USA. Far Eastern manufacturing will always be less expensive unless they use robots thereby reducing US jobs.
One upside is the dollar is now far weaker against the UK pound, making oil (for us) less expensive.