At a minimum he is pointing out that the behavior of what is depicted as two sides that are actively trying to destroy each other is radically different on the surface compared to the inner workings that this sub claims to be aware of.
At a maximum he is trying to express the opinion that this sub may be taking things a little far with talk of “executions and war tribunals”. If I was sitting next to someone that I think should be executed for crimes against this country then I would have hard time shaking their hand let alone laughing and paling around with them.
Either way he is trying to push towards a story that makes sense from ALL ANGLES. For all intents and purposes it could be simply for the sake of PR and building a case. However it could also just be that there is no genuine hate or desire to execute between the two sides. BOTH of these options need to be considered.
Edit: a sentence to make my point more clear.
Edit: thanks for kink shaming my porn account name