Tough question: as a 15 year old immigrant of different culture and religion and concepts, he seemed happy enough to have emigrated, but as a 100 year old he wasn't so sure about whether that ladder should be pulled up.
(or maybe he was just miffed that instead of loanwords from hebrew, eg Tacheles reden, the kids in germany are shocking their elders by getting their loanwords from other semitic languages, eg Ahki?)
which sides are both sides again? in this case I claim that it's difficult for imported skills to be transmitted to the next generation when the US educational system is (or at least it was during my time) built around producing the sort of highly fungible Schumpeterian worker bees who play well with others.