It is more of a realistic assessment that at lower levels of selectivity one is not going to see 100% graduation rates, in any major. Of course, there are some turnaround cases of students who improve their study skills and motivation in late high school or early college, and some aspects of the educational environment can affect how successful the turnaround students are. But it is unrealistic that believe that every lower stats entering college student will be a turnaround student who eventually succeeds, even if one believes that everyone should have a chance to try.