Political posturing....

Two of EU's most critical exports/wealth generators are Germany's cars (and the derestricted ABs that are critical for R&D/testing/real-world crash data generation of cars w/latest-tech high-speed dynamics/safety)...and London's financial industry....

Many advantages of US/EU/RoW globalization....capital flows easily to where it is optimally invested/consumed; affluent people increasingly choose where to primarily reside/have wkend homes based upon quality-of-life considerations....and tax dollars of <<1% of population can easily change national/state tax revenues/budget deficits and political fundraising campaigns for major elections (consider tax revenue dynamics in CA/NY/NYC/CT and US Presidential campaign fundraising hurdles )....

Some London car nuts already keep their more interesting cars at a Munich wkend house for more optimal use....and a few car nuts from NYC/Chicago have gotten LA wkend houses for optimal environment for their cars/driving....ability of affluent car nuts to arbitrage local inefficiencies/regulations is greater than ever before....and I suspect most politicians/regulators in economically-relevant global epicenters realize this phenomenon will likely intensify over next few yrs....