Gun Control Reform Activism

guillaume: Why millions of Americans — including me — do not own the AR-15
First, because the country has a standing army to provide for the common defense. Thus eliminating the actual reason for the Second Amendment.
Second, because most areas have an actual police and a State national Guard force to deal with local defense issues.

Oddly enough, Guillaume, the reasons you do not want to own one, standing army, cops & national guards, are the latent underlying reasons too many assault rifle owners indeed want to own them. For fear of a tyrannical police state, or tyrannical standing army, floating navy & flying air force.
Assault rifles are the only way unorganized militia mobs can fight back against tyranny - comparable small arms fire against oncoming US soldiers & marines equipped with military issue assault rifles. Since unorganized mobs cannot legally acquire anything to combat against ships & planes, less yet tomahawk missiles, they covet small arms as a security blanket (a false sense of security blanket).
Assault rifles are the only solution, and forget about those cosmetic reasons they give - varmint hunting, target shooting, home defense - all just concoctions to hide the underlying reason fear of a tyrannical govt, generally a democratic one too.
The prospect of tyranny cannot be suppressed by the paranoid minority, without assault rifles!