So lets look at this from a different perspective. An aggressive guy gets into a fighting stance, you put your hands up in order to de-escalate. You say that you don't want to fight. The only reason you did this is because the other guy got into a fighting stance.
If a person thinks you are most likely to back down, then "knuckling up" and appearing dangerous is the fastest way to end the conflict and come out no top. It's a risk but all conflicts are. Everything is not so one sided. If someone got into a fighting stance with you but didn't advance, would you attack first, back off by creating distance, or walk away?
And before I get blasted with post. This isn't how I operate. My whole thing is about creating uncertainty when I'm in a conflict. I don't want my aggressor to really have a clear idea of what I may do unless he backs off. If he's uncertain about his own safety then that's an advantage to me. If he sees a way out to end the conflict without physically fighting then I want him to take it.
When I was in my 20's I worked at a video store. The customer became very aggressive and asked if I wanted to physically fight him. He was ready to fight and had clinched fist as he hit the counter. I backed away (creating distance), got the manager (created more distance) and waited outside the building until the customer was finished with his purchase. Perfect example of how "knuckling" up not only de-escalated the conflict, but it totally forced me to remove myself. Could I have beaten the man, Sure. But at that point I had more to lose than just a fight. He knew that and took advantage of it.
When the guy came outside after his purchase he avoided me. He didn't approach me, because no he understood the rules were different. He didn't say one word to me or even look at me. He got in his car and drove away. At that point for him to approach me would mean he would have more to lose. Because he would physically had to come to me.
There's always two sides to a conflict. If one person is de-escalating then it's usually because the other is escalating and the person that is trying to de-escalate and stop the fight is reacting to what the aggressor is doing. Does it always play out like this. Of course not. But like I said, every conflict is a risk