Nevins told reporters at this year's TCA press tour that, while he was aware the latest episodes had drawn some criticism for being far-fetched, he "really liked" the terrorism drama's sophomore run.
"I think some of the criticism seems fair, but I think suspension of disbelief is the scaffolding all storytelling is based on," he argued. "There's a truth to the way that show is written, and a truth to the characters that overcomes all."
The cable network chief insisted that Homeland - which scooped several awards at last night's (January 13) Golden Globes - will "maintain at the very highest level".
"I think [the criticism is] a good thing for the health of the show, and I have enormous confidence in the people who write and perform that show," he said.
Homeland was renewed for a third season in October, with Nevins suggesting that the series has "got a really long life" and "can go in a lot of different directions".
"I think Homeland is in a very interesting place," he said. "We made the decision to end this season with a fairly clear set-up for season three, which is the opposite of how they ended season one.
"Seasons one and two were fundamentally about working out the initial movement of Brody (Damian Lewis) and Carrie (Claire Danes), and they came to a rest at the end of season two, but with a very clear launch for season three. They are at the very early stages [of writing that], right now."
The third season of Homeland will premiere on September 29 in the US and will air on Channel 4 in the UK.
> Homeland exec defends second season: 'First year was just as absurd'
> Homeland exec on third season: 'It will be smaller scale'
Watch Homeland win the award for 'Best TV Series, Drama' at last night's (January 13) Golden Globe awards:
Golden Globes winners gallery
Copyright: PA Images Jordan Strauss/AP