What time was it? Greeley was always all over the map.
Once the Confederacy started the war then Greeley was supportive of the war effort, if not always supportive of Lincoln's actions in pursuing it. In may ways Greeley was far more blood-thirsty than the Southern supporters paint Lincoln as being.
Before he was threatened, he was solidly in favor of States rights to independence. After he was threatened, he was solidly against states rights to independence.
This is "The Chicago Way."
People just suddenly change their minds without any obvious reason why they did so.