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Wtf am I reading here?
Really? That'll be why motocrossers ride around bare-ass naked. And downhill mountainbikers. Gotta use those ninja cat-like reflexes to avoid getting destroyed.
A huge number of them do. Particularly MX riders.
Your argument is stupid though, have you ever worn armour? The only movement it stops is movement that you're not meant to do. Like bending your spine backwards, or folding your ribs over a rail. Have you ever wanted to bend your ribs? Or your collarbone? Maybe putting a nice S-bend in your tailbone is your idea of a fun afternoon, it's not mine.
And your last argument, drunk vs sober? Full of massive amounts of stupid. Incomprehensible amounts of stupid. Reducto ad Absurdum, we should all ski drunk and naked because we'll be less likely to get hurt, because we'll ragdoll smoothly. Is this seriously what you're suggesting?
Took it a lot further than I needed to.... did you read the bit where I said Reductio ad Absurdum? It means, more or less, to take an argument to an extreme in order to make it look stupid. And you suggest I go learn some reading comprehension...
And hence I suggest you go learn some physics. You contradict yourself in an obvious way. You say it makes it harder for movement to happen... let's simplify this a bit for arguments sake.
Making up numbers here, let's pretend it takes 100N of force to break a bone. If you take an impact of 110N directly on a bone, you're going to break it, right?
Now let's say you apply some armour over the top, and lets say that this armour takes 20N of force to deform significantly to the point that force is transferred to the underlying object. If you again apply a force of 110N, first you're going to dissipate 20N in getting the armour to deform. Leaving 90N to be applied to person underneath, meaning the bone doesn't break. But then you stack on the fact that you'll absorb even more force before the armour changes from elastic deformation to plastic deformation and finally reaches the tensile limit and breaks. But by then you've probably absorbed a lot of the energy involved. Likewise, because the armour will deform (relatively) slowly, you extend the timescale of the impact and decrease the moment. Let's not even get into the realm of distributing the force over an area rather than a point force application.
I hope your reading comprehension level was sufficient to make sense of that.
Now you could argue that if you take an impact of say 300N and the armour absorbs 50N total you're still going to get hit with 250N and break stuff. But if that 50N is the difference between cracking a rib and having it snap off and puncture a lung, I know which one I want.