What is a law abiding citizen?

(talking gun control AND some other rights)

What is a law abiding citizen?

I've heard the phrase used over and over, but don't quite get it. Until someone commits a crime and gets caught, they are known as a law-abiding citizen.

Should we always assume that everyone is a law abiding citizen until they prove otherwise? Should that really be the only requirement for certain privileges? What if someone is law abiding, but there are extenuating circumstances, either confirmed or suspected, that make one think they may not be capable of handling the full rights and responsibilities of American citizenship?

A few examples might be:

1. Someone who comes from a family with a history of violence and abuse
2. Someone on prescription medications that may also alter their moods or ways of thinking? (even a medication for clearing skin comes with a warning that it can cause suicidal thoughts, btw, so not just talking psych meds, but all meds with that capability)
3. Someone with a mental illness.
4. Someone with a physical illness that may lead to great pain/depression.
5. Someone who believes in a religion that calls for illegal violence.
6. Someone who drinks alcohol on a regular basis.
7. Someone who smokes marijuana legally for medical reasons.
8. Someone going through a bitter divorce or other major stress in their lives.
9. A war hero suffering from PTSD/flashbacks.
10. Victims of a violent crime who have not yet healed.

If we start a line saying "this is where we should start questioning people," where does that line get drawn? Will it ever? History proves it won't.
That leaves us with two possible thoughts: Punish everyone by not affording anyone those rights without question, or put everyone at risk by giving those rights to all.

Thoughts?