Suppose you see a door with a sign on it that says 'If you walk through this door, there is a 20% (or 10% or .1%) chance the lions on the other side will kill you'. Most rational people would think 'Maybe I should stay on this side of the door -- where there is a 0% (0.00000000000001%) chance lions will kill me.'

'Safe Sex' is sex with your lifetime partner -- as God intended. If everyone married a virgin and remained faithful, AIDS would not exist. If you marry a virgin and remain faithful, you will not get AIDS.

jpboaty:

But but but.... men are made of billions of cells, some
are imperfect, some could be potential killers of the HIV
virus... why didn't any show up to do the deed?

Don't men evolve?

Don't the cells in men evolve?

If not, why not?

Evolution seems to be anything you want it to be.

Okay, this has probably been answered already. I'm way to lazy to go scrolling back through 400+ posts. But I just couldn't resist, so here goes:

(1) "But but but.... men are made of billions of cells, some
are imperfect, some could be potential killers of the HIV
virus... why didn't any show up to do the deed?"

Each virus is a separate, functional entity unto itself. Someone infected by HIV--or any other pathogen, really--is under attack by one ginormous army of invaders that gets bigger with every passing hour.

(2)"Don't men evolve?"

Sure. That's why we have groups of people who share common physical traits.

(3) "Don't the cells in men evolve?"

Sure. But only germ-line mutations get passed on. Non germ-line mutations are changes in "adult" body cells, and unlike germ-line changes, they don't get passed on to offspring.

Each cell of your body is part of a single organism--that organism being "you"--and can't survive or function on its own. The immune cells are pretty much the only ones that actively destroy invaders, you've only got six types, and they're not even the most numerous cells in your body, and they can't reproduce anywhere as fast as a virus can replicate. In spite of this, they work fairly well against a wide variety of pathogens...but not so much against HIV, both because it mutates like a bastard and because it parasitizes the same cells that are sent to kill it.

And the only thing that "evolution" is is genetic change. That's it. No more, no less. And sure, the cells of an adult animal's body (which are more sometimes change their genetics for one reason or another. Unfortunately, in adult cells, the changes are usually to the systems that regulate how they reproduce, and when to die of old age. Someone else here called it right when they called that "cancer." Or, if the cell is damaged enough, it simply dies, as in radiation sickness.

The cells of your immune system aren't going to evolve into faster, stronger cells by themselves any more than your car's engine is going to evolve to feed on hay and then run off to live in the woods, because they don't pass traits onto offspring or live independently. Like the car's parts, they're made by specialized systems--tissues, in this case--elsewhere. You don't change the part without changing the plans the factory uses...and then by building a brand new factory that can use the new plans. So until we find a cure, vaccine or treatment that works and start using it, the virus dies out, or enough people are born with random, slight genetic differences that make them less susceptible to HIV, we're up shiat creek.

(4)"Evolution seems to be anything you want it to be."

Sure, if by that you mean it seems to be the best answer that we can find for why organisms work like they do, look like they do and act like they do, based on what we know about the way the natural world operates. You know, that whole "science" thing. It a theory flexible enough to incorporate the new information that comes in every single day and gets modified as we find out more, unlike the "Talking Snake" theory that never seems to get updated with any new data ;-)