Allowing China to sell their cars at a loss in the US is definitely a bad thing. It allows China to take over the US market by undercutting the competition. The reason for the teriffs, as far as I understand it, is that the Chinese government is subsidizing the EV manufacturers in an attempt to kill competition and corner the market. It is an anti competitive practice that, if it paid off, would allow China to artificially push other EV makers out of the market, then raise prices when their competition is gone.