It seems to me that prigs, as defined in pg's article, are just jumping on the transgender issue because it's an easy way for them to enforce rules. From my understanding, having read both articles, PG might say that the prigs have chosen to ride the lgbt movement. The problem is not with the lgbt movement itself.

Unfortunately, this gives the movement a bad reputation. Some prigs aren't lgbt people at all, but they speak on behalf of them, as they also speak on behalf of other groups that they aren't a part of. Some prigs might actually be a part of the minority they speak for, but I would hazard a guess, based on no data, and say that these are the minority of all prigs.

I think PG's problem is with the prigs, not the lgbt movement itself. Can these be separated?