Time is money, so betting on action with no immediate benefit (reading a book, voting for the "correct" candidate from the wrong party) versus action with immediate benefits (the dopamine rush from playing a video game, or skipping voting to go to work/enjoy your day off) is risky, at least as far as Scumbag Brain is concerned.
In that vein, I don't believe laziness exists; just misaligned incentives. Intellectual, even emotional appeals tend not to work when people are insecure. You have to alleviate the insecurity somehow.
I know there were candidates who supported laws that would have benefited my family members, such as sick leave, parental leave, etc. I informed my family members who these candidates were. I even asked them what kind of life would they want for their daughters. But nevertheless, on voting day, none could muster the will to visit a polling booth or request an absentee ballot via mail. Yet it's not as if they are wealthy enough to forgo having jobs.
Therefore, I must surmise it's simply laziness.