The arguments against these tests are, of course, awful. Objective tests are the best way we know of to remove human bias. Aptitude tests (basically IQ tests) are the best way we know of to measure someone's natural ability (determined in early childhood) with little influence from their experience. Since their arguments make so little sense, it is reasonable to wonder about the psychology of opponents of standardized testing. But their arguments are, at least on the surface, about predictive value.