I have and everyone account I have read so far, says he bought the guns legally. Even the FED's say so.
He even managed to get hold of explosives and booby trap his property. I also see that he was being seen by psychiatrists. Isn't that quite normal for Americans? One apparently said he was dangerous to the Police. Still at the time of the killings and his purchases he was not diagnosed mentally ill by anyone of note.
If you have a link proving any of the above is false. I am willing to read it and change my mind if necessary. If it's just opinion then that is not fact.
I might be wrong but did you say when purchasing guns you are obliged to tick a ''i am mentally ill box'' if that is so, well whoever came up with that must also be mentally ill.
Anyway, I'm off back to Breaking Bad