Earlier quoted context omitted.
Start a game, do absolutely nothing. Witness aliens killing you nonetheless. Aliens aren't the poor good natives, and it's so easily disproven I don't understand how it ever become to be a thing.
Drop into your local forest, do absolutely nothing. Eventually witness a wild animal kill you. Does that justify ecocide?
Sure locally a bear can get me in a forest, but I don't need ecocide to survive a bear, and neither the engineer has to to survive biters.