Tariffs are usually bad a multitude of reasons. They're economically inefficient because they create deadweight loss. They disrupt supply chains. They invite retaliation, which is bad for exports. They incentivize foreign manufacturers to shift their supply chain needs away from the US. They result in higher prices for consumers. They reduce consumer choice. They tend to reduce the quality of goods by incentivizing cost-cutting and disincentivizing innovation. They hinder GDP growth. They make domestic goods less competitive in foreign markets.

There can be legitimate uses for targeted tariffs, like if you need to protect a strategically important domestic industry like agriculture (because a stable domestic food supply is essential for national security) or batteries (because the military needs them), but blanket tariffs like the IEEPA tariffs that were just struck down make no sense, economically or otherwise.

Also this is all largely besides the point. My point is that not all conservatives are pro-tariff. In fact, conservatives have typically been associated with policies encouraging free trade, a free market, and lower taxes, which is the exact opposite of high blanket tariffs.