Here's a terrible argument: everyone who is in favor of the war in Iraq who is physically capable of serving in the military but has not volunteered is a coward who doesn't want to get his hands dirty.
As Richard points out, there are some reasonable arguments that are roughly in the neighborhood of this baseless attack, which call on war supporters to recognize the human costs of war and provide motivation to treat troops right. It is a long way, though, from these reasonable arguments to accusations of cowardice.
Here's another terrible argument: everyone who is opposed to the war in Iraq is ignoring and appeasing terrorism.
Are there any reasonable arguments anywhere in the neighborhood of this baseless attack? I suppose that we could say that it is loosely related to a request for alternate strategies for how to deal with terrorism. It a long, long way, though, from this kind of reasonable discussion to accusations of appeasement.
If you're looking at the links, you'll notice that both terrible arguments came from a post by Timothy Sandefur of Positive Liberty entitled "Straw Men". Surprisingly, the plural does not indicate that Sandefur is exposing both of these baseless attacks for what they are. Sandefur ably tears apart the former argument when a reader tries to use a form of it against him. However, he chooses to employ a version of the latter argument himself, against that very same reader.
I'm still adjusting to Positive Liberty being a group blog, and I haven't come to any sort of global conclusion about whether this is a change for the better. I will say this, though. Jason Kuznicki would never engage in baseless attacks like that one.