What a gutpunch. It's shades of 2004 (more on that later), but also worse for so many reasons.
Complex systems don't fail due to a single cause. They're always running in some sort of degraded mode — there is no perfect union — and catastrophic failures have multiple vectors, often cascading. Assigning blame after the fact can easily turn into an exercise in emotional release, the desire to identify a specific "root cause." Even in hindsight, this is more often storytelling and internal politics than anything else.
Still, without retrospectives, we cannot hope to improve.
I don't think it's productive to try and blame voters, or even non-voters. Where does that really lead in a democracy? This kind of thinking is always tempting, and carries a bitter tautological truth that a democracy delivers the government people "deserve," but it must also be rejected out of hand. It is a poisonous form of fatalistic elitism, a surrender. No.
I also don't really think it's right to blame Lena Dunham, Martin Sheen, or any other celebrity figurehead, even if you think their participation was counterproductive. They're amateurs, and maybe they're annoying or insufferable or distracting, but voting is the least we can do, and they were trying.