A lot of voters are ignorant idiots who prefer not to think about politics, but have been convinced that voting is something they should do. I have an acquaintance who was convinced by their progressive politically active partner to vote and, before an emergency intervention corrected this, was thinking about voting for an insane Republican because their name sounded cool.
Pumping up the number of voters in aligned bases is still a good idea for parties, but the deeper you get into those kind of apathetic non-voters, the more they’re going to vote based on nonsense.