I'm not sure how appropriate this metaphor is. Aikido strikes are all based on sword strikes, but...striking is for suckers. Aikido is a fine discipline if you want learn to subdue people without hurting them. Of course if you're a sadist, once you've have somebody subdued you can do whatever you like to them, so as a fighting style subdual seems to be the optimal strategy. It requires less force than lethal combat, generally, and afford the opportunity of unchallenged lethal force.
As both an aikido practitioner and a former karate/TKD man (and someone who has trained continuously for 20+ years), I have to disagree with you on this point. There are a
lot of strikes which can be incorporated into aikido training which do not have a basis in sword technique. I'm not saying that many of the sword-origin strikes are bad, but I do think to limit your training to
only those techniques is kind of stupid.
Personally, I think that many an aikido practitioner can learn a thing or two from getting some basic boxing/kickboxing training and spending some time hitting a heavy-bag. You have to train sometimes as if your opponent is
not going to take the proper ukemi to protect themselves, because in real life the thug on the street who attacks you won't know one damn thing about ukemi. And in that situation, you had better known damn well how to hit them, and hit them hard in the right spot so as to bring the confrontation to a halt quickly. I have found myself in situations where my application of a good, solid, non-sword like atemi-waza ended the situation rather abruptly. On the other hand, I once had to - as you say - subdue someone with a rather unpleasant joint lock. It all depends upon the scenario.
In addition, I also think that many aikido practitioners could benefit from getting some basic ground training via judo or BJJ. I have some of these basic skills that I've learned from some very nice BJJ guys who train in my dojo. It's more than reasonable to assume that you won't always end up on your feet; hell, much of aikido training is protecting yourself when you
fall down, so knowing how to recover or deal with someone who jumps on you while you're on the ground isn't a bad idea.
I understand that you are defending aikido technique here, and I applaud that (so long as it isn't the foo-foo "spiritual energy" crap too many in aikido practice). But in your desire to defend your art, please also have the humility to understand its limitations as well. A good martial artist knows both, I think.