It's really tough to persuade people to try something different by hammering away at them with dogma. Neil deGrasse Tyson sums this up very well: http://youtu.be/-_2xGIwQfik
More importantly what does that video have to do with pointing out that OSS would get a bigger "kickstart" if the project was not limited to a closed OS?
Perhaps I read into it, but your statement definitely came across as loaded and seemed to imply that an open source project aimed at a closed platform somehow had less merit than one aimed at an open source platform (I interpret that as dogmatic).
The video merely points out that one should try and understand the motivations and rationale of others before arguing the merits of your point of view. That someone would try and make the lives of developers on any platform easier, I think, is a good thing. I would have hoped that it would encourage other developers to try and do the same on other platforms.
More importantly what does that video have to do with pointing out that OSS would get a bigger "kickstart" if the project was not limited to a closed OS?
Is it harder to install Rails on osx than ms-win?