I suspect you may be exactly right about that for a decent subset of “undecided” voters. It’s hard for me to wrap my head around given the stakes, but there are people I know who simply say that they are “uninterested in politics”. 
They don’t strike me as ill-intentioned or lazy. They’re just busy handling all the craziness that their lives throw at them, and think that politics is corrupt, that policy is boring, and that their votes probably won’t make a meaningful difference. And they’re so used to political hype and exaggeration that when something genuinely alarming comes along, it’s easy for them to shrug it off as just more partisan rhetoric.
