Reading the messages that were sent after its announce of the forced
cancellation, I found a response (
http://hamakor.org.il/pipermail/discussions/2011-May/003024.html ) from RMS
himself, which supports the non-boycott interpretation:
"To criticize my actions is anyone's right. However, what you are
doing is stretching my views into something else (which didn't come
from me) and claiming that makes me a liar. That is not valid."
I have also discovered RMS has already given a speak in Israel (8 years ago):
http://www.research.ibm.com/haifa/info/news_ibm_GNULinux.html
All in all, I really believe the anti-Israel interpretation is not valid.