But what followed the preface was not a statement of fact, but rather a question.
No, it was a question followed by an answer to the question. Together they form a statement. In Martin's case it is an opinion.
Oh boy.... What does it take to get through to you?
Let's try again, shall we? Here's the quote you refer to;
You are missing the point. Sure, many people travel with firearms, but how many of those have just used that weapon to shoot somebody? It's about Oswald's frame of mind. Having just tried to kill a man with that rifle, would he risk transporting it in a duffelbag with the barrel sticking out? I seriously doubt it....
1. I made the comment that it was about Oswald's frame of mind, because you missed the point I had made.
2. I asked a question
3. I stated my opinion that I seriously doubted it.
My opinion is not an answer to the question, nor does it indicate that I know anything about Oswald's frame of mind. It's merely an expression of doubt.
The question and my opinion combined do not constitute a statement of any kind and it most certainly does not, as you claimed about one hour ago, imply that I somehow think I know what Oswald's frame of mind was.
I did not claim that Oswald would never have carried the rifle the way you described. I merely stated that I doubted it!
If you don't understand the difference, than I don't know what else there is I, or anybody else, can tell you to make you understand.