If someone's ballot was filled out incorrectly, then it shouldn't count.
The idea that some people are deciding how someone else voted by making an "educated guess" is just absolutely ridiculous. People can literally adjudicate a ballot to say the person voted however they want. Why even bother voting? It's just decided by whoever adjudicated the ballot.
"I consider it completely unimportant who in the party will vote, or how; but what is extraordinarily important is this—who will count the votes, and how." --Josef Stalin, 1923