He raised the idiotic example as a reason why he needs firearms, and I have no idea why you added "ninja-like" to your response; it's logical that burglars are either going to take the stealthy approach or just go all-in straight away. In either case it's going to take the average person by surprise, whether or not they're tooled up as much as practically possible.
Furthermore, you're acting like firearms are the only way to defend what's you and yours, and you're adopting common tactic of assuming extremes to disparage the opposing arguments: try to avoid it, it's idiotic.
As a side note, I'm all for self-defence classes; frankly I'm sure that there are plenty of things the average person could learn about defending their person, family and possessions. ie. it's not the size of the weapon that counts, it's what you do with it.
If you restrict the availability of firearms and means of legal ownership then it is logical that they will be less easily available. If they're less easy to acquire, then logically less people "good" or "bad" will have them.
Furthermore, guns are not like drugs, alcohol or any other vices as far as the average person is concerned, so the comparison does not work.
Also, if you're going to bother responding, then try and actually answer the questions and points I put forward.