I would personally have used the "too broad" close reason rather than "non-mainstream" to close your off-topic question. The experimental evidence supporting conservation of energy is a central part of a year-long introductory physics course, talking up most of two chapters of a typical introductory textbook. Your question is answerable, but it contains so many misapprehensions about how to describe a conservation-of-energy problem that a proper answer would contain nearly as much detail as a textbook chapter --- but with a lot of back-and-forth with you to ensure that some other misconception did not distract you along the way. All of our users who are educators have answered questions like yours from students in person, and that experience suggests that an answer which will satisfy you intellectually will not be a good fit for our question-and-answer format. That's why your question was closed.
We do not usually take action to change the close reason on a question, even in the more common case where attempts to make the question on-topic actually change the reason that it doesn't work for us. For instance, sometimes the asker of a "too broad" question will edit the question to make it more specific, and turn it into a "homework-like" question. Such questions stay closed, with (hopefully) a justification in the comments.
Furthermore, it's quite rare for us to need to revoke someone's permission to cast close/re-open votes on questions, and basically never in response to a disagreement over a single review. Your request for such censure is evidence that you don't yet understand how our community works. Stick around for a while and you'll start to see what I mean.
