Signing up to buy American weapons and fossils isn't exact what I'd describe as "good long term strategy". I'd rather suffer medium to strong economic pain now than have Europe be dependent on the US for the rest of my life. EU citizens are very willing to suffer the economic pain if it means we get to be independent from the US, public opinion has been shifting in that direction for a while even before Trump's first term, has accelerated with his first term and exploded after his tariff theatrics started.
Nobody wants the EU to retaliate over the tariffs but neither do people want the EU bending the knee and kissing his ring, there is an option where we have a tariff deal without mandatory investments into the US. Paying what boils down to tribute isn't exactly what the people think an independent EU should look like.