I don’t believe you will find such heresy within the Constitution of the United States of America. The right of the people shall not be infringed, and since convicted felons have shown themselves to be lawless, why would anyone consider them when addressing who can be armed.
The Second Amendment is clear, and Felons don’t need a second amendment, they will be armed regardless, which is precisely why we the people should never be disarmed for any reason, especially any reason based on broad specifics such as crazy, mental health, convicted felon, domestic abuse, can’t take care of oneself, aged, infirm, all such are distractions that really should not even be addressed, as they lead to movements to disarm the public as reasonable or even necessary.
Considering individual rights of “we the people”, once you have disarmed any group, or individual, you then become responsible for their personal protection, as you have taken away their ability to protect themselves. So now all crazy people and convicted felons become wards of the State. That isn’t exactly what you had in mind was it?
And obviously what you are describing is becoming true. Need help taking care of yourself (can’t handle the social security paper work?) - can’t buy a gun. Crazy (many combat veterans have some type of PTSD)? Can’t buy a gun.
A bit off topic - but my daughter was watching some goofy “comedy” - the Santa Clarita Diet or something, where the wife turned into something and requires a diet of human flesh. She knows it is wrong, but needs to eat. So she only kills “bad” people. Right now she is working her way through some guys that proclaim to be NAZI’s (they have a softball team!). I asked my daughter “I suppose they won’t write in Communists as the next set of “bad guy” victims?”
And as the left has already proclaimed Conservatives as NAZI’s, I guess we are fair game too - whether it be having our guns taken away, or served up to zombies.