Simple, the thread was specifically about draft avoidance/dodging during Vietnam.
Part of what mods do in GD is to try and keep threads focused on the Op. He started talking about WWII. Thus the intervention. Also, only a note.
Here is the part from the GD rules:
If I felt he was trying to derail the topic on purpose, I would have given a warning.
I see no reason to believe that and so just a note.
As I got ninja’d let me add. We are enforcing rules more that in the past as there is more coverage now. But these rules have existed for the last year.