If this was simply a question about the utility of a locked knife versus an unlocked, then I think you have already agreed the answer must be that either will do exactly the same jobs (assuming similar knives of course) except that the locked knife will be less likely to ever close accidentally. Thus the answer is that any job putting the blade at risk of closing is better done with a locked blade than a non-locked blade, and safety is an easily supported position. Just look at Exhibit 1, the scar on my finger.
Now, pd, if you are trying to rationalize away the difference between a 4" plastic handle swiss army knife and a 9" serrated black-bladed (because you're less likely to be seen sneaking around in the dark in your ninja outfit & blackface)knife advertised as "tactical" knife and promoted by its maker as follows:
"The Commander knife - battle tested and proven - incorporates some of the most advanced ergonomics ever featured on a folding knife. The knife, already in use with elite armed forces, European Military strike teams and NATO Counter-Terrorist units throughout the world was chosen by the U.S. Navy SEAL teams for issue to special units within the Naval Special Forces Units."
well, that ain't aimed at slicing cardboard, now, let's be realistic. If you want to justify your choice of a bigger stronger uglier knife generally sold specifically for defense purposes, based on what you are using it for, then you better be hacking big branches off tree limbs before they go into a shredder, or skinning wild hogs that have invaded your farm.
So if you're going to buy a lock-back similar in size & functionality to a Swiss army knife, you don't have to worry about that mad prosecutor or that jury of teachers & librarians.
If you just want to buy a Commander because they are sturdy, well-made tools, that you appreciate, then do so, and just carry them around when you expect to need them as a tool.
If you are worried about ever having to use them in self-defense, then buy them with that in mind, and hope that if ever needed, you will have the ability to distinguish between a minor threat of some kind to which you over-react with unjustifiable force, and a serious threat to your life to which you respond with justifiable reactions. In that case, the small non-locking folder won't do the job you expect your tool to be able to do, so it would be the wrong purchase in teh first place. Because it will come down to what OTHER people, specifically 12 other people, think of your use of the knife, not what YOU think of it, or what the rest of the Bladeforum readers think of it, that matters.