You are bang on the money, Kryer.
The truth, if someone would just spit it out, is that some people are reacting strongly to Bioware's inclusion of homosexual relationships, because they have strong political and religious objections. But they've realized that this doesn't play very well, so they've tried to turn it around.
When a writer includes gay relationships in a drama, this can be explained by saying he has simply made an artistic choice to address one of the many realities of human life, as might be expected. Occam's Razor applies - the assumption that he is doing it because he has a political agenda is arbitrarily adding a further condition, making this explanation less probable than the simpler explanation.
But because the complainants don't want to be upfront about stating their political motives, they try to make it appear that it's the inclusion of these natural elements that is the political act, and that they are merely "gamers" who don't want "politics" in their games.
It is highly disingenuous, and quite transparent.