And ignoring the EU’s role in this, never mind the Kaiser’s (really starting with Bismarck), is ignoring the history of the spread of this ideology.
I think you're putting too large a share of the blame for socialism on Bismark or Germany.
Germany didn't force FDR or Congress to pass the New Deal. Nor did Germany force LBJ to push for the Great Society. Or for any subsequent passage of socialism in the U.S.
Nor did Germany force Britain, or France, or Greece, or Italy, or Canada, or Sweden, or Israel to adopt socialism. Those countries' native populations demanded entitlement benefits.
Socialist movements were well underway throughout Europe decades before Bismark. And were deeply entrenched long before the EU.
Socialist countries (like the U.S.) have nobody to blame but themselves for their domestic policies.
One does not have to force one’s philosophy on another country to bear the blame for it. It may be ironic that Marx was expelled from Germany, thus merely being the scapegoat for what the leaders of that country were implementing.