Is that because he did the obvious things someone trying to frame Oswald would do like confirming Oswald owned a rifle and stored it in the garage, hated JFK, and was a violent nut job? This where you don't understand the point but tell me he didn't do those things.
We've asked these type of questions repeatedly - it's one way of looking at the assassination from a different perspective, as a sort of attempt at proving a negative - and every time these "Why didn't?" type questions are asked the conspiracy believers and the so-called "undecideds" get quite angry and upset. Very angry. They don't like these questions. Not a bit.
If a person is truly interested in taking this event apart, in looking at it inside and out, upside down, as a sort of intellectual exercise then these types of questions should be welcomed.
How can one prove a negative? That is, that Marina wasn't coerced into lying about Oswald? Okay, how about asking the question that if she was coerced why didn't she say he hated JFK? Or that she saw him with the rifle that morning? The same can be asked about the Paines. If they were part of this framing then why didn't they more fully implicate Oswald?
Again, these are legitimate questions. Except for those who are unwilling to consider the possibility that their conspiracy beliefs are flat out nonsense. Which they are.