2A Infringement, Required Safety Courses, Mentally Ill, etc.
I've searched the forums and found a few helpful threads, but would like to find more discussion and sources for the topic of 2A infringement, especially with regard to what counts as infringement.
For practical/safety purposes I can see why we may not want criminals and mentally ill persons owning guns, but constitution-wise why is this acceptable? What's the legal case, jargon, etc. for this view? Or, is the 2A some sort of individual right that should not be infringed upon at all? (former criminals should not be allowed to defend themselves?). I'm worried that the justification for not allowing mentally ill or criminals to have guns because of safety of others could lend itself to justifying the requiring of safety courses before gun ownership and/or carrying in public (safety of other people).
I think many of us see required safety gun courses for ownership as infringement. But why does it seem like there isn't a lot of visible outrage over the safety course requirement for concealed carry in some states? Is a safety course an instance of infringement or not?
Links & sources appreciated for further reading.
Thanks in advance