The whole "we evolved from apes so why are they still around" is probably mainly down to the terminology used. By all accounts, we evolved from "apes", but these apes were nothing like today's apes. They were completely different species, and all modern apes today (inc. humans) evolved from them. The reason we used the name "ape" is the same reason we call the fossil Tiktaalik a "fish"; because it looks like one and it is easier to describe it as one than invent another type of animal to compare it to.
Really you can look at it like this:
Really you can look at it like this:
Ancient Apes
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Humans Chimpanzees Gorillas
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Humans Chimpanzees Gorillas
