The funny thing is that when I asked the original question I wasn't really even considering defense as a factor.  I was just trying to decide whether to carry my RSK, Juice KF4 or SOG Powerlock for EDC.  <img src="/images/graemlins/grin.gif" alt="" /> Defense is kind of a non-issue.  I have it ingrained in me from bazillions of hours of training to respond with equal (or even less) force than is put upon me, so odds are that in a defense situation that I can not or will not run from, I'm not getting ruthless and bloody with a knife.  I'm either going with hands/feet for restaint or non leathal weapons (if any).  If lethal force is actually needed it's coming from my sidearm...not a knife.  Like I said...  The funny thing is that when I asked the original question I wasn't really even considering defense as a factor.  I was just trying to decide whether to carry my Benchmade RSK, Leatherman Juice KF4 or SOG Powerlock for EDC in an effort to be well prepared for an unexpected urban/suburn survival situation.  One where I might have to travel 20 miles on foot to get from work to home...etc.  I'm sure Flippy will have some comment about how ridiculous this is but I can ignore that as I have done in the past. <img src="/images/graemlins/wink.gif" alt="" />  The multi-tools certainly have lots of uses  but I can fashion a lot of what I need with a good *strong* blade like the one on the RSK and it is a lot lighter than any multi-tool worth its salt  <img src="/images/graemlins/grin.gif" alt="" /> Kinda funny how the thread evolved though. <img src="/images/graemlins/smile.gif" alt="" /> heheheh..... 
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Learn to improvise everything.