Copyright and Fair Use SR

Q 11: A teacher videotapes a rerun of Frontier House, the PBS reality show that profiles three modern families living as homesteaders from the 1880s did. In class, students edit themselves "into" the frontier and make fun of the spoiled family from California. This is fair use.
SR: I said that this was not fair use because it is making a home recording. Most PBS shows are available for purchase or can easily be contacted to get permission, so I am a bit surprised that this is considered fair use.
Q 14: On Back-to-School night, an elementary school offers child care for students' younger siblings. They put the kids in the library and show them Disney VHS tapes bought by the PTA. This is permissible.
SR: I think that this is one of those grey areas because in other aspects of fair use students and teachers are allowed to use video clips that they did not buy, yet the PTA buys the movies and is not allowed to show them at a school function??
Q 15: A teacher makes a compilation of movie clips from various VHS tapes to use in his classroom as lesson starters. This is covered under fair use.
SR: If this is false than how do other aspects of fair use that are just as infringing on a copyright true??
Q 16: At a local electronics show, a teacher buys a machine that defeats the copy protection on DVDs, CD-ROMs, and just about everything else. She lets her students use it so they can incorporate clips from rented DVDs into their film genre projects. This is fair use.
SR: This is unreal that a teacher can use an electronic device to "rip" anything and everything. The teacher/school should have to buy a copy or license of whatever is being used unless it falls under fair use, like using no more than 3 minutes of a video clip.

The rest of the questions I felt were common sense and they did not surprise me. I took the quiz and scored 12/20 correct. Four of my wrong answers were the ones above that I responded to. I think that many of the things in our government are very screwed up at times so that very few people (except those with law degrees) can make heads or tails out of it.