actually, humans have done that many times, each new area humans have moved to they generally conquer the indigenous peoples and move on.
as for invasion movies... well, they wouldn't be invasion movies if the aliens were friendly.
but most of them it's because the writers believe (as do a lot of people) that aliens are more likely to come her for resources, or to live on the planet and the humans generally just get in the way.
if you want friendly aliens, you got men in black (millions of friendly aliens and a few bad ones), E.T., the abyss, several kids movies, batteries not included, and several others.
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