“According to the non infringement clause of the second amendment all arms are legally owned.”
No. If you steal a firearm from me, or buy a stolen firearm from the guy on the corner, and use it in a felony murder, your firearm was illegally obtained, just as would be an automobile or a horse that was ridden in on. There are SOME things that need to be leavened with common sense.
Is there nothing to small to not be argued about anymore?
The second amendment does not mention anything about arms are acquired. Laws about theft and murder are reserved to States by the 10th amendment.