well RMS has nothing to do with Open Source. Open Source is different from FSF. But I generally agree with your comments. I have seen in a number of videos that RMS tends to always fall back on the "Proprietary software is evil".
Repeating the same arguments has got to be frustrating and people might pick up on it. (assuming that RMS has very little to say but says it often).
FWIW his reasons of proprietary software being evil are[0]:
* Proprietary software obstructs the use of its programs
* Proprietary software obstructs social cohesion, fragments communities.
* Proprietary software obstructs the customisation and adaption of programs.
* Proprietary software has network effects: if you have skype, I am more likely to have skype.
* Proprietary software prevents choice; swapping out proprietary software with something else can be tricky, if it's not resting on standards then sometimes it's simply impossible.
In fact, it's more vicious: If you have Skype, I am more likely to need Skype.