Jonathan, I have read your comments at that site and in my opinion, you are trying to twist what is said and trying to provoke.
But that's my opinion.
JW's aren't trying to prevent the public from celebrating holidays. You know that they share their beliefs in the PUBLIC ministry but they don't get engaged in preventing non-JWs from having holidays.
We do not look to stop people from practicing their holiday's whether public or private, we just want people to respect our conscience in abstaining.
The entire point of their door to door work (which is public in nature) is to convert people. Hence it is, in fact, an effort to stop them from celebrating holidays as well as many other things - including, but not limited to, dying instead of accepting blood.