Another Frustration

Speaking of student work, how can it be that college students do not know how to write a research paper?  I’m grading research projects from various courses that proceed for 1,500-2,000 words of factual assertions, quotations, and concepts and insights drawn from the reading without one footnote or endnote.  There is a bibliography but it is impossible to verify sources, check the context of facts, or understand the slant of particular arguments without reading every work in the bibliography.  How can one become a college sophomore, let alone a college senior, without at least passing familiarity with research paper requirements?  Do elementary, middle, and high schools not teach them anymore?  Where did the students who display these skills learn them?