There is no reason to believe that evolution is not a "chaotic" process. You seem to be adding strange value-added sort of judgments onto the theory of evolution that do not belong there, and I'm not sure why.
No, evolution cannot be boiled down to "a)things which are alive are those things which meet the preconditions for existance
b)things which die out are things which were unable to meet the preconditions for existance."
To be honest, I don't even know for sure what these statements mean.
Evolution describes the process by which organic life forms genetically mutate and therefore change over time, dynamically, in relation to environmental cues and circumstances. That is all.
This was a hugely important discovery, for the reasons I've already mentioned. We've mapped the human genome. We already know for a fact that we share DNA with certain other species, we have common ancestors with other primates. This has confirmed the theory of evolution in ways no one ever anticipated that it would be confirmed.
Using DNA, we've found the genetic basis for many illnesses. We've discovered that MS shares glial cell malformation similarities with epilepsy and bipolar disorder and that the three may be genetically linked. My grandmother spent most of her life lying in nursing home paralysed from the neck down with MS. Oddly enough, I have TLE and bipolar disorder as do other members of my family. These sorts of discoveries make a difference to me, and to a lot of other people who've suffered with these diseases. The more we know the closer we get to better treatment modalities and cures.
We've made a lot of headway with Alzheimers, Parkinson's, I could go on for hours. We can now treat severe pain well enough to perform major surgeries. Heart transplants, lung transplants, FACE transplants. The applications for this knowledge are endless.