How does the infrequency of Oswald's prints compare to someone who was actually there and did the deed? The only explanation for you LNers is that Oswald must have worn gloves. So are you sticking with that?
What do criminologists and forensic scientists say about finding identifiable prints on weapons?
Or in general at crime scenes? . Let's limit it to firearms since that's the issue you raised. Not only today but fifty plus years ago? This is not the movies; this is real life.
So, what do the experts say? Have you researched the issue? Yes, this is a challenge because I've read what they say. And you won't like it.
For example, from a 1997 article published in "The Journal of Forensic Identification":
"Latent fingerprint examiners generally know that even when cutting edge technology such as cyanoacrylate fuming and laser/forensic light source examination are utilized, successful development of latent prints on firearms is difficult to achieve. In reality, very few identifiable latent prints are found on firearms, a fact that has been discussed in both the literature and the judicial system."
And that's not an anecdote.