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"Why would only some evolve?"

Because only certain subpopulations within a species are subject to certain environmental pressures. If the environment is stable and is favoring the existing characteristics of a population, then stasis will be selected for.

"What do you think the chimp-like ape thought when it gave birth to a human? How did the human survive with a chimp mother?"

This is a creationist howler. No evolutionist thinks that evolution works in huge saltations. Speciation takes place in a population; the alleles in the population change in tandem. No two individuals in the population are very different than any other; they are all the same species. There is no magic moment when an individual becomes a new species. It's a process that is only evident after the fact, and it's the entire population that is changing, not just an individual. If the genetic links that existed between the subpopulation and the parent species are severed, then a new species is born.

BTW, nobody is saying we evolved from chimps either. Another creationist whopper.