Regarding political correctness, the Futurama writers are imhO the most cowardly ones of the big series
I'm not sure I agree with this. Most of the "big issue" episodes (of which there aren't many, and most of them revolve around environmental issues) are either pushing an agenda in a satirical way ("Crimes of the Hot" and "Into the Wild Green Yonder" are earnest in intent but exaggerated in execution) or are poking shameless fun at both sides of the issue ("The Problem With Popplers" and "The Birdbot of Ice-Catraz" do this). And it doesn't bother me when the show makes a statement like "Global warming is real, and we'd best get our shit together if we wish to prevent it," because 1.) I think this point is valid and 2.) the statement is not made self-righteously, at the cost of humiliating people who may happen to disagree with the show's stance.
I think "Proposition Infinity" is the only episode of the series that takes a blatant stand on a contemporary social issue, and I agree that it does so in the most politically-correct--and, ironically enough, least tolerant--way possible. PI is so mean-spirited and cliche-ridden and lazy
; it demonizes opponents of gay marriage without honestly considering why otherwise decent people might take issue with same-sex relationships.
I've said this before, but you know you've failed at satire when people who agree
with your ideology (because, yes, I agree that gay marriage should be legal and a number of people who oppose it are hypocrites) are still repelled by your portrayal of the social issue in question. PI is my least-favorite episode of the series, easily--for a number of reasons, really. Its simplistic, super-partisan take on the issue of gay marriage is one of those reasons.
MacFarlane dares much more
I agree that Family Guy is ultimately a politically-incorrect show (and I don't mean that as a criticism), but Seth MacFarlane is obviously a liberal and Brian is his mouthpiece. Again, even if I may agree with the ideology the show's pushing, I tend to find hyper-liberalism (or hyper-conservatism, though it's much rarer on TV) a bit off-putting.
I am rather amazed that they dared to go for a halfway fair representation of evolution set in motion by some intelligent being in "Clockwork Origin" (and I wish they would dare something like that more often)
I agree with you completely. I don't love "A Clockwork Origin"--it's an average episode in an an average season; not bad, but also not stellar
--but I do appreciate the approach the writers took to portraying the debate on evolution.