Well since you mentioned you live in Germany... Was not Trump complaining about your trade surplus? ;) Imho, democracy is not about making optimal decisions all the time, rather it is about introducing competition (or inner conflicts) among those that are in power, that prevents them of budding up and eventually becoming corrupted. Because the logical (not moral, but logical) thing to do would for those with power to (ab)use it. I would even argue that Trump victory and UK decision was a blessing for Europe as it awoken the general public to the possibilities.