Having definitively established that Baby Boomers are the worst generation of all, most responsible by far for the fact that Donald Trump currently has a 43.7 percent chance of becoming president, let’s turn to the question of what role millennials are playing in keeping this election uncomfortably close.

Despite being the one cohort that supports Trump overwhelmingly, Boomers tend to get a pass from Trump critics, who in turn focus most of their ire and analysis on millennials—young voters who regard Trump with incomparable loathing, but who aren’t flocking to Clinton.

Anti-Trump forces aren’t wrong to see millennials as the key to this election. Their error is in short-handing their critique to suggest millennials are somehow more responsible for Trump than older, more conservative cohorts. But if you stop dividing cohorts by age, and do it instead by ideological leaning, the problem becomes clear. The younger and younger that left-of-center voters get, the less and less propensity they have to vote at all, and the greater propensity to vote (if they vote) for a third party.

A recent New York Times-CBS poll found that “third-party candidates draw their strongest support from younger voters. Twenty-six percent of voters ages 18 to 29 say they plan to vote for [Libertarian Party nominee Gary] Johnson, and another 10 percent back [Green Party nominee Jill] Stein.”

Mobilizing young voters has always been a vexing challenge; in a way it would be weird if teenagers entered adulthood with firm political priors and the same level of civic commitment to voting every two years that their parents have. What makes this pattern so troubling this election is that we’re just 16 years removed from a world history–changing lesson in what can happen when too many disillusioned young progressives vote for third-party candidates. We may be facing a situation where voters who were barely potty-trained during the 2000 recount never internalized the consequences of that election. And the question is, whose fault would that be?