I don't think people who downvote before reading count as something to legitimately complain about, as they can change their vote after reading. "People who downvote without reading are bad" is a fine enough statement for conversation and making one's point, but the argument against downvoting is that one shouldn't be judged by those who fail to gain information about what they judge, which isn't so applicable here (except to the extent the voters are biased to keep their initial vote).

In fact, if people who downvote without reading are often people who downvote before reading, the evidence that a few voted before the submission could have been read and judged on its merits is even less impressive.