First, ideas aren't being repressed. Pseudoscientists are free to express themselves as much as they want, and people are free to read (and often pay lot's of $$$$ for) their ideas. A quick perusal of the Internet or the nonsense sections of your local library and bookstores should suffice to support that. Public schools, however, have a very important, even critical, responsibility to educate our children. The decision to NOT present "alternative ideas" is not equivalent to repression of those ideas. It's the school's responsibility to teach that PI = 3.1415926.... because it produces correct results. It is NOT the school's responsibility also teach that PI = 3 (because it's in the bible) or PI = 3.146264 as advocated by supercrank Ralph Rene
http://www.rene-r.com/circle_squared.html, who has quite a following among hyper-conspiracists.
Second, the real question should be: What's right with astrology? The answer: Nothing. Astrology is pure bunkum that has no basis in reality. It is exactly like creationism in that respect, and yet, there are millions of people that believe in it, including groups that would like to have it taught alongside astronomy in public schools. Astrologers in this country, fortunately, don't have the political power that their creationist counterparts have.
More ideas that we could teach in science class:
Phlogiston Theory
Aetheric Vacuum
Hot Comets
Electric Stars, which is loosely associated with Velikovskyism
The list is almost literally endlless, and every cranky idea out there has it's supporters. We should only teach what has been
demonstrated to work, and that is what we do (not well enough, unfortunately). There's no need whatsoever to teach that which doesn't work.
I want to emphasize my use of the word
demonstrated above. That's EXTREMELY important. In fact, it's paramount. Demonstration is irrelevant to belief and point of view. As martial artists, that's something we should ALL be familiar with.