Please re-read the sentence as posted:
"evolution is a tool of the left, used to destroy the notion that our rights don't come from a creator and are inalienable"
The poster did not say the evolution had beed *devised* for that purpose, but that it has been seized upon or wielded by some Marxists and their ilk.
To some extent, that is true; much as post #2 in this thread says that many of the sexual scandals in the Catholic Church (as well as, say, liberation theology) were part of a deliberate effort by Marxists to subvert the influence of the papacy worldwide.
But that is a separate issue from the evidence for and against; just as the presence of Al Gore in the debate is not disposative of the discussion of global warming.
Cheers!