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Actually, you''ll notice that one of the marketing points of the movie was the excellent effects, and the use of non-humanoid aliens, which was extremely costly. I don''t remember a lot of movies doing that before (Alien maybe...)
but the interesting thing about Starship Troopers, as you said, isn''t the plot. Rather it''s the message, if you think about it five seconds.
A race of evil bugs from the other side of the galaxy, that would have send an asteroid on our planet ??? How convenient.
The point of the movie was to make you think about how cool fachism can look (IMHO). And the use of non-humanoids as the enemy is just a clever trick to make it more obvious. They are different, they are bugs, let''s wipe them out...
If they had been more like us, we probably would have been thinking a little bit more, wouldn''t we ?
So you see, how our preconceived ideas can be used to manipulate us. The big asteroid being just an excuse to launch a massive attack against a race we would have otherwise ignored (maybe), or treated differently (more probably).
The appearance of the aliens you design is a narrative tool (mm, not sure of the expression, but you get the point?) and should be used just like that : a tool. Unless you are a scientific trying to study alternative life forms (then, refer to the Tierra project, amongst others).
youpla :-P