If this is the case, why are there monkeys?

The same reason there is still both trees and grass. Plant genes making a living in 2 different ways...

Same reason there are still McDonalds' and gourmet restaurants, 2 different markets..

That something proved beneficial for the apes that took to the savanna, doesnt mean the thing proved beneficial for the ones who stayed up in the trees.. you get "islands" of life, or as Dawkins calls them "Workshops of evolution"

Re Heinlein. I'm re reading my dads collection, so have only recently read The Moon is a Harsh Mistress and Tunnel in the sky. Just finished Glory Road. His views are interesting, but are not as clear cut, just as Farhad shows, as he tends to explore things in his books. It's possibly they are/have reflections of his true feelings, and their apparent evolution/revolution/subtle changes reflects his views at the times of writing of each book. i've noticed how "sex" is often almost completely ignored as a human trait, when exploring some of the stories with an adolescent male protagonist (anything up to 25 ish) and his female characters have a lot of consistent traits (although to be fair, his male chars are often very samey too). I'll get around to stranger in a strange land again in a bit, but The one i finished last night was Glory Road. It tackles the relationship/cultural aspects of sex obliquely, considering how different parallel universes (interconnected) allow utterly diverse and somewhat isolationist evolution of culture. How very different attitudes and norms can be seen as moral, given an appropriate context. Just as TMIAHM allowed the moon penal colony context to justify exploring stable and appropriate social adoptions/human relationships, Glory Road presents the idea that there are as many possibilities as you can come up with.

He also shows a strong hint of a dislike at the sexual culture of America at the time, and an acknowledgment that "enlightenment" as to their unreasonableness is not the same as being free form it's influence. He condemns earth pretty harshly, by declaring it to be the only place that had invented Prostitution, in any form, with all other places considering Sex to be High Art, worthy of much study and respect. The concept of Prostitution, or of sex being a commodity, had so pervaded the culture that it influenced every aspect of relationships, referencing examples of dowry, and men paying for dates, as cultural transaction. However, the lead female is almost fearful from the start, that her promiscuous nature and past will cause the Hero to see her as a slut. At the end, he makes the following point:

"The typical American female is sure that she has genius as a couturiere, as an interior decorator, as a gourmet cook, and, always, as a courtesan. Usually she is wrong on four counts. But dont try to tell her so.
Unless you can catch one not over twelve and segragate her, especially form her mother -- and even that may be too late.
But don't missunderstnad me, it evens out. The American male is convinced that he is a great warrior, a great statesman, and a great lover. Spot checks prove that he is as deluded as she is. Or worse. Historo-culturaly speaking, there is strong evidence that the American male, rather than female, murdered sex in your country."

"What can I do about it?"

"Slip over to France now and then. French women are almost as ignorant but not nearly as conceited and often are teachable."

But he also mentions: ".. is where they tried to outlaw sex entirely. I had seen enough of that dreary graveyard in ..." which i think was referring to the UK, but cant be certain. Almost certainly somewhere in Europe. So his disgust at our attitudes and behavior regarding sex is world wide, and not just at America of the time. (its dated 1963 for ref)

I think he had strong practical, anarcho, very small government, butt out and leave it alone views about organization, with an acknowledgment that a sizable portion of the populace have opinions too ill educated to be considered as needfully relevant to the organizing body/government, whomever.

I'm reading The Star Beast now. thats fun.

To answer you question dystopian... it was good in a 'proto-evil dead' kind of way... and for Sam's hilarious portrayal of a Charles Manson-esque hippie sociopath... but it was also utter, utter cheese... and not the good gourmet kind, but the kind that is propelled from a can by compressed air.

you're probably talking about El Chombo's song "Macarron Chacarron (feat. Andy's Val Gourmet. The video for it is on here: http://www.videosift.com/video/CHACARRON-Best-Music-Video-EVER-hahaha

but it is also the soundtrack for one of my favourite vids:
http://www.videosift.com/video/Swedish-Chef-Gets-Jiggy

I would say that it is mostly so well known because of its prevalence on YTMND, as explained here:
http://wiki.ytmnd.com/Ualuealuealeuale

I noticed that too watching a while back. So funny.

Watching gourmet chefs making culinary masterpieces in less than an hour sure makes one crave a BigMac.

According to YouTube comments, Song is "Shakaron (Shark around)" by "Andy Val's Gourmet" afaik

It may be gourmet, but since it doesn't come with that shiny cup that she's using, I'm just not interested.

Hey HistNerd, that's 4 free bags of gourmet coffee! Get it right. But anyway, that's just one of our many perks.