The whole point of "supply side economics" aka "trickle-down economics" is that, theoretically, cutting costs (taxes) allows you to sell more products at a lower price-point. It's a win-win situation, hypothetically.
https://gamefaqs.gamespot.com/a/forum/5/53090760.jpg
Tariffs achieve the opposite. They increase the price and lower the quantity sold, a lose-lose. There are situations where you can use tariffs to protect an industry that's important - for national security, cultural heritage, or ease an industrial shift - but a blanket tariff does none of that, it only hurts.
Just look at how the steel tariff affected the construction industry. The additional cost of moving to American steel was too cost prohibitive, so instead of costing more, construction projects just vanished. This
further
decreased demand for American steel. So a tariff meant to protect American steel just weakened at least two industries.
Another way to look at is this. Imagine it costs $1 to make a Chinese fidget spinner that sells for $2 and $3 to make an American fidget spinner that sells for $6. Trump implements a 400% tariff on Chinese fidget spinners, now importers sell them for $10. How much does it cost to buy fidget spinners in the US? $9, because American suppliers raise their prices, too.
"We live in a country Hasire.." ~ yosouf06
REVOLVER STAKE! http://img.photobucket.com/albums/v717/ChocoboMog123/AltEisenRChocoboMog.png