"You're only standard for what may be considered beneficial, is whether or not the organism lives long enough to reproduce, and you only know that, when it happens."
Yes, so you observe and see whether or not it does. If it causes the organism to be less likely to pass on it's genes, but the percentage of the population that possesses that gene increases, then natural selection is falsified.
Can't see how that would happen? That's because it wouldn't. The fact that it doesn't is what shows natural selection to be true.
This is yet another logical contradiction. No offense, but I've had enough....