He campaigned and won with tarrifs as one of his main policy points. Voters favour them. Americans get tarrifs because Americans want tarrifs. Deal with it.
We have laws that limit what presidents (and Congress) can do. By extension that limits what voters can get by voting. Americans got/get tariffs because we currently have an administration that is willing to break the law.
In addition, to focus on the point you claim that voters favored them. I've never seen any convincing evidence that this is true, and what evidence I have seen always seems predicated on the claim that the foreign suppliers pay tariffs, which is generally completely false. So, if they were in favor of what they understood, they did not in fact support tariffs in the real world. Further, I did see some polls suggesting that voters favored highly selected tariffs for specific products from specific origins. Again, that's not what the administration has sought to impose.
Even so, I never saw polling that indicated even a plurality of voters were in favor of them one way or another.