Added Sep 26 2019: I'm not going to do an analysis or summary of these responses – but I and others think it would be interesting to do so. If you'd like to do so, I'd welcome that and will link your summary/analysis in the top of this post here. All the data is accessible in the Google Spreadsheet below.
Submit your answers anonymously here: https://docs.google.com/forms/d/e/1FAIpQLSfiUmvT4Z6hXIk_1xAh9u-VcNzERUPyWGmJjJQypZb943Pjsg/viewform?usp=sf_link
See the results here: https://docs.google.com/forms/d/e/1FAIpQLSfiUmvT4Z6hXIk_1xAh9u-VcNzERUPyWGmJjJQypZb943Pjsg/viewanalytics?usp=form_confirm
And you can see all responses beyond just the first 100 here: https://docs.google.com/spreadsheets/d/1D-2QX9PiiisE2_yQZeQuX4QskH57VnuAEF4c3YlPJIA/edit?usp=sharing
Inspired by: http://www.paulgraham.com/say.html
Let's start with a test: Do you have any opinions that you would be reluctant to express in front of a group of your peers?
If the answer is no, you might want to stop and think about that. If everything you believe is something you're supposed to believe, could that possibly be a coincidence? Odds are it isn't. Odds are you just think what you're told.
Why this is a valuable exercise
Some would ask, why would one want to do this? Why deliberately go poking around among nasty, disreputable ideas? Why look under rocks?
I do it, first of all, for the same reason I did look under rocks as a kid: plain curiosity. And I'm especially curious about anything that's forbidden. Let me see and decide for myself.
Second, I do it because I don't like the idea of being mistaken. If, like other eras, we believe things that will later seem ridiculous, I want to know what they are so that I, at least, can avoid believing them.
Third, I do it because it's good for the brain. To do good work you need a brain that can go anywhere. And you especially need a brain that's in the habit of going where it's not supposed to.
Great work tends to grow out of ideas that others have overlooked, and no idea is so overlooked as one that's unthinkable. Natural selection, for example. It's so simple. Why didn't anyone think of it before? Well, that is all too obvious. Darwin himself was careful to tiptoe around the implications of his theory. He wanted to spend his time thinking about biology, not arguing with people who accused him of being an atheist.
Thanks to Khorton for the suggestion to do it as a Google form.
It would be impossible to summarize my opinion of everything that's been written here. However, I'll second some commenters by noting that many of these views, if published, would likely be net-positive for the author (assuming that the full explanation was well-reasoned and specific).
Examples of posts I think could lead to reasonable discussion (there are many others):
I understand why someone might be reluctant to post about their views; good criticism is hard to write, and it's hard to predict how Forum users might respond to your ideas.
That's why I (one of the Forum's moderators) offer feedback and editing services to anyone who wants to publish a post. I'm not a perfect oracle, but I'll do my best to predict how people might react to your arguments, and suggest ways you might clarify your points. If you don't wind up publishing, your views will be safe with me.
(You can also use an anonymous email address or Forum account to send me a Google doc; I will encourage you to use a name, but I'll provide feedback either way.)
Overall, while collecting anonymous feedback has benefits, it seems much better to me that these points be expressed in full posts that can be discussed in detail, and I'd like to facilitate that process.
(If you're uncertain about the value of this process, I can refer you to others who have sent me work, and they can give [hopefully] unbiased feedback.)
*Of course, some of the views expressed on that form would invite widespread disapproval without strong evidence (e.g. personal attacks) or seem like trolling and would likely be received in that spirit (e.g. "right wingers should be euthanized").