"So GNU's gesture is almost purely symbolic"
Yeah... and pedantic. And childish. I support free software, I commit to open source projects, I love just about any form of Linux and I prefer OSS when its as good as proprietary (sometimes it is... like blender... and sometimes its crap in a bucket... like GIMP ...)
I think my aversion and disappointment comes from the fact that, like PETA, this group and the RMS brigade are very much the public face of a movement, but a movement that doesn't need a single face... but regardless, they are the what outsiders see, and when you turn every piece of software into a political statement, you end up hurting the cause.
There are people out there who will, through some sick twisting of the mind, treat animals poorly or not care about actual animal abuse because PETA has been the face of the animal cruelty movement (or GreenPeace, another great example of this effect, I'm sure it has a name) ... even though the cause is good, and there are good organizations (ASPCA)... the annoying, loud, politically charged reactionary groups like PETA, GreenPeace, GNU, RMS/FSF ... those groups turn people away from free software...
Maybe I'm ranting more about the politicalization of software... maybe its all tied together and one and the same... I just know that I've heard plenty of people say they don't use Linux because it doesn't have X application, or X drivers... when it really does, but the common distros don't include them because they aren't in-line with their political view of the situation...