I don't want to express that "randomness is driven by evolution", that's why it's not "opposite" as in your definition but as "negation". Don't you think that the commonly held view on evolution as on a random process and the evolutionary theory where the process of evolution is an inevitable statistics of the population are incompatible?
Is there an idiom that means "it was something inevitable"? I am not sure if it's the case, but there's this idiom, it was something like "this was ought to happen", but it was an actual idiom instead of just a phrase and I don't remember what it was exactly, I had it on the tip of the tongue, but I have it no more.
That is not irony. It would be irony only if avoiding the result caused the result. That's not the case in OP's question, as it's perfectly possible for the result to be inevitable regardless of trying to avoid it. Palpatine's quote is also not ironic, as saving others did not cause his master's inability to save himself.
Harry watched them go, feeling slightly uneasy. It just occurred to him that Mr and Mrs Weasley would want to know how Fred and George were financing their joke shop business when, as was inevitable,
From a book It will be evident that poet’s function is not to report things that have happened, but rather to tell of such things as might happen , things that are possibilities by virtue of being in themselves inevitable or probable. ‘Being in themselves inevitable or probable’ Does the meaning change if the PP goes behind?