I thought Iraq didn't have any WMD

Not at all. I wasn't in Iraq, but I was in Vietnam.

But this isn't about Vietnam or Lebanon or Grenada or anywhere else, this is specificly about the bullexcrement used to justify the war in Iraq so it only counts for that conflict.

That accusation is the same as accusing someone of cowardice.

No it isn't.
Take a serviceman/ex serviceman who opposed the 2nd Boer war and supported the Great war or viceversa, which stand is he the coward for?
Take a serviceman who opposed both wars, which then.
Each must be dealt with on its merits and cowardice doesn't even rate on the meter of a decent arguement.
The only possible angle approaching "cowardice" here is a abject fear of facing the reality about the politicians lies.
That happens to be a common thing throughout history where people have to face the question of "what the hell was that all about?" after the conflict.
All too often some people slide into some myth as a comfort as they can't face the reality of it.