By definition Christian Zionists believe that the return of Jews to Israel is a necessary prelude to the apocalypse. Even if the Christian Zionists you have encountered did not believe this (which would make them....not actually Christian Zionists) consider that there are, at minimum, tens of millions of these people in the United States, and your dad's "more than a few friends" just may not constitute a representative sample.
An apocalypse, by definition, doesn't only happen in Israel. The apocalypse applies to everyone. Afterwards, there will be a thousand-year reign of Christ on Earth, so it's not clear why should I fault them for hoping for this... or consider it somehow 'antisemitic'.