I'll have to disagree Ravir. The analogy is apt. For it to work it doesn't require the purpose of the two objects to be the same, what's important is the relationship between an object, its purpose and the probability of use. I don't mean to sound like my former philosophy professor but that's just how I see it.
Again the purpose of the object is completely irrelevant and is tied to the fallacy that is your need argument. The FACT is at the end of the day the possessor of the object determines what it's purpose will be, in which case it doesn't matter if every automatic weapon ever constructed was only used for killing people. You have yet to answer why what something was used for by others has any bearing or relevance what so ever on whether I should be allowed to have said object.
What is annoying about your argument is essentially the double standard nature of it. You apply this need argument to automatics as a basis of whether one should be allowed to have one or not, but apparently such a standard doesn't apply to other things one doesn't need. Your perceived purpose of an automatic weapon apparently has some bearing as to whether one should be allowed one or not. But that standard doesn't apply to other objects either where right to ownership is concerned. There has to be a reason for that and for whatever reason you are being rather obtuse and unwilling to examine that facet.
Further I have encountered few who just plain ignore direct scrutiny. You had one post where you said essentially 'bring on the questions'. 2 pages later many are left ignored. Hell questions/objections posted 20 pages ago remain unanswered. For example by your argument if wants to participate in an activity that translates into a need for ownership of the object required to accomplish that activity. So it would stand to reason that if the activity I want to do is shoot an automatic weapon, I should be allowed to own one, by your argument. But on the other hand you object to ownership of automatic weapons and build in your 'rent at a range' argument. So explain why we shouldn't all be banned from owning golf clubs and should only be allowed to rent them instead.