If I interpret your post correctly here’s my take :
The dealer told you on the front end that you had the tariff risk . Despite that you made the purchase and accepted that risk without doing some research beforehand on what the estimated tariff might be. So yes, I think it is fair that they don’t take it back you made the purchase knowing there was the risk, the fact that you didn’t look into the risk before agreeing to the purchase isn’t their fault.
The dealer told you on the front end that you had the tariff risk . Despite that you made the purchase and accepted that risk without doing some research beforehand on what the estimated tariff might be. So yes, I think it is fair that they don’t take it back you made the purchase knowing there was the risk, the fact that you didn’t look into the risk before agreeing to the purchase isn’t their fault.