How about keeping guns away from a 6 year old full stop? Are you suggesting a 6 year old has mental capacity to handle weapons? When they reach their teens its a different matter but children of that age shouldn't be taught how to use firearms, they should be taught they aren't toys and don't touch them.
Yeah I think kids can be taught how to handle firearms that aren't loaded. They can also be taught that they aren't toys and they shouldn't touch them under any circumstances without an adult present. They aren't mutually exclusive.