Humans invented meaninglessness. Things, by default, can be considered to mean themselves. An ant looks at a rock - what does it mean? A rock. It doesn't need to mean anything else.
(Proto-)Humans decided one day that 'A' (or some other symbol/sound/etc) does not mean itself, but is a reference. That means that 'A' can now be meaninglessness.
This was a fantastic invention, perhaps our greatest! It would be difficult to talk if A could only ever mean the funny lines that make up A.
But this invention came with downsides: now humans could declare they themselves were meaningless, or their enemies were meaningless, and kill someone with this invention as justification. They could also declare one human meant more than another human, or that some ideal meant more than food and water and healthy kids.
This also led to logic paradoxes where A could point to B which pointed to A.
Now, a different question is: why are so many humans wired to want a purpose? Because we're social
@thespcicifcocean
Actually, measles may be a *cause* of MS or other autoimmune problems. Measles antibodies are higher in such patients, indicating a possible lingering infection.
One possible reason is that your body doesn't just train itself to recognize invaders, it also puts a lot of effort into identifying *itself*. Killer cells go through a training phase and those that don't pass get destroyed before they are ever released to the rest of the body.
Watch the anime Cells At Work if you can. It's actually pretty informative.