Tager was clearly deranged, but his mistrust of Rather has good roots. Rather was at the center of the Killian Documents Controversary, aka 'Rathergate'.
Unless the Wikipedia article claims Dan Rather has an ability to telepathically beam messages into his viewers' heads, I don't see a strong connection.
How could his mistrust be rooted in an incident that happened years later?
No, the question is, which one is the time traveller?