I don't think you in particular infringe anyones rights but as statistics show, alot of legal firearm owners have had their guns stolen/lost. In terms of gun ownership I think people should either have the level of dedication and/or passion you bestow or not have a gun at all. It would be alot safer for themselves and Joe Public.
Hmm. A moderate stance on gun control. Much more realistic. However, rights are absolute... if I am allowed a firearm then you must be allowed a firearm as well, provided that you will not abuse this right. To this end, the Act specifies conditions which one must fulfil in order not to be disqualified. To this end, the requirement for competency already addresses your concern that people who have no dedication will acquire firearms.
With 3.5-4.5 million licensed firearms in SA, what counts as a lot of lost or stolen firearms? Unfortunately lately we've been seeing house invasions where people who keep their firearms in safes are forced to open up and hand them over - at gunpoint. Just serves to illustrate the point that there's not much sense in having your gun in a safe. Better always to have the firearm on you, or if you're sleeping, within reach. The only situation where this wouldn't hold true is in a household with children, but even then it's a better idea to gunproof them. Children should always be gunproofed, ie, taught not to take chances with firearms and what to do should a child find one. This is part of the responsibility of owning a firearm.
To elaborate on that point, I believe that firearm ownership is 1% right and 99% responsibility. Ownership does not entitle one to threaten with or discharge a firearm indiscriminately. It does not confer onto the firearm owner the power of judge and jury, divine or otherwise. It does not invalidate the law, nor does it allow the owner to prescribe their own. These things are for criminals. The firearm owner must instead be careful, alert and always aware of the consequences of his actions.
Restricting ownership to a few dedicated firearms owners won't help. My point is that defense of firearm ownership is not about me... it's about the average person in the street. The more guns out there defending him or her, the safer that person is. The more chance of someone pulling a gun in defense, the less confidence and motivation the criminal has. Guns in criminal hands become all but meaningless with enough guns in responsible hands. Firearms are less easy to acquire when people are pointing them at you.
Remember, criminals are after the soft option, the easy way out. Increase the risk for them, and suddenly crime loses it's attraction.