Please forgive the following sarcasm (it has a moral though).
"Please, dear sir, don't hurt me. I can't touch you for fear of causing pain during my restraint. No, no, no. No need for putting that Ruger to my head...yeah. Good. Now let's discuss Buddhism for a moment while I call the cops. See how easy it was to disarm you peacibly?"
Ehhhh....it doesn't work. Would you shove them? Or take a chair and knock them unconscious.
Ohhhhhhhhh! I know! You were tricky! I get it Sagan. Okay, okay. You can't "hurt" someone (though you haven't as yet DEFINED "hurt", pain, et cetera for me clearly so I'm left with thinking you don't know what they are) but you CAN knock them unconscious, from a distance and painlessly!
You get a tranq dart and shoot it in their neck or their haunches and watch as they crash to the floor.
Hmm. That might leave a headache though when they wake up. So you leave some Tylenol and cushion his fall with pillows!
Dang. To think you had almost foiled me Sagan.
WHAT is left? YOU haven't told me what you would do, and I don't think you will, because you know all too well what you WOULD do (VIOLENCE! MURDER DEATH KILL, MURDER DEATH KILL!) to "restrain" someone "without force". Or maybe you don't know, and that's why you don't tell me.
Seriously, though, pain threshold may have everything to do with it. My brother has little if no feeling in his upper left thigh so you could stab him there and he wouldn't feel it. But on the right thigh, it would bring him down in an instant. Now suppose whenever you stabbed his thigh and the blood came flowing out it didn't hurt him, but the loss of blood made him frightened for his life and departed quickly to prevent bloodflow and avoid conflict.
Presuming, of course, you know his left thigh is numb. Or else it wouldn't work.
Now tell me, how would you prevent your fellow soldiers from dying in the armed forces? Take a bullet for each one? Or shoot the "other" guys?