It's black and white. Shall NOT be infringed.
Unfortunately the world is not black and white. It just isn't, and believing otherwise is not rational.
Neither is the subject of ownership by a prohibited person, there are states and places where this is a grey area and the 2nd Amendment (much as I love and adore both it and the folks who wrote it) is more than a little ambiguous when viewed from certain perspectives. Not that your understand is lacking, but it’s obvious that other people have different opinions from their own perspectives. If this were not true then there would be no need for this forum, the NRA, the SAF, or any of the other pro 2A organizations in our country.
Another way of looking at this is if the individual is the one making the decision to knowingly break the law then they are also the one making the decision to permanently curtail some of their own rights. The Bill of Rights is about restricting what government can do, not about what citizens can do to themselves.
By breaking the law in a fashion that allows for a felony charge could it not be argued that the individual is tacitly giving the government permission to curtail one’s personal freedoms? I am no lawyer, but it seems to me that breaking the law opens the door for the government to enter/control certain areas of our lives or impose consequences for the decisions we make that the citizenry says are unacceptable. One of those consequences currently is a permanent ban on the ownership of a firearm by a felon.