1. I don't have to 'believe in evolution'. It is a proven, scientific fact(despite the frequent and erroneous argument that it is 'only a theory').
It is only a theory only a Scientific Theory which means that it has passed a certain rigorous set of tests that say that it is accurate enough to use in the development of further theories. This is many orders of magnitude more rigorous than any religious belief (say 10^10 orders of magnitude).
P.S. I am mostly posting this to not use my mod points for evil.
Of course assuming you believe what I just said could you ever justify someone becoming a billionaire? Can any one person affect the world around them on that order of magnitude? I know that I've personally never seen it every person that has millions to billions of dollars has a huge team of people around them that support them and they skim some portion of that money off for themselves.
However we do have evidence that life CAN exist we see it every day, we understand to some extent how it forms from certain combinations of chemicals as experiments have been done which resulted in DNA (or RNA I can't remember which) being created in labs by simulating what we believe the environment to be on the early earth, we see the abundance of carbon, hydrogen and oxygen in the universe, and at least trace amounts of a myriad of other elements, and our mathematical models, as primitive as they are, dictate that it is likely that life exists on some other planets. Therefore we are currently testing the hypothesis that life exists on other planets. Our methods are primitive and we have a vast search ahead of us but our models and current knowledge support the idea that life should exist on other planets because the sheer orders of magnitude we're dealing with indicate that 1:1 trillion probabilities are happening trillions of times per second.
Sometimes it is fun to feed the trolls
P.S. Stream of consciousness of some small fraction of the evidence on both sides not meant to be a complete argument.
"Starship infantry" would have been better, although given the book's purpose as pro-military propaganda it lacks that romantic haze required to blur away the pointless death and destruction such troops have always created when deployed outside their own borders.
I've never been quite clear as to whether it was pro-military propaganda or straight sarcasm. In reading many of Heinlein's other works I eventually started to believe that it might indeed be the latter. Either way Heinlein must have been a very interesting person (read crazy) possibly in a good way.
Once assimilated you'll find a lot of the second or third generations being just as lazy as any other native.