Why then does the Left waste so much oxygen finding these small groups to push into our faces?
My two bits, in addition to all your correct assertations, it's about keeping their opposition on defense. Instead of being able to talk about long term effects on society and individuals (search American Family Association's In His Image movie for some of those on this particular topic), we have to respond to the charges of being transphobic, sexist, hateful, close minded, old fashioned, blah blah blah. It's like the old set up "When did you quit beating your wife?"
Same mentality applies to most proggie causes. Climate change, racism, multiculturalism, illegal immigration, kung-flu response, you name it. Those pushing these things don't want debate because 1) they lack the data and critical thinking skills to actually support their ideas and 2) the ideas are secondary, the primary goal is amassing power cause all us dumb plebes need some one smarter than us to take care of us.