The understanding of who is considered a transsexual changed greatly over the last century.

Whose understanding in particular are you referring to when you speak broadly and grandly of "the understanding" here? And do you really mean "understanding," or is the word "assumption" perhaps more apt?

Anyone who has looked into the phenomenon of "transsexualism" and "transgenderism" in depth twigged decades ago to the fact that many/most TIMs are heterosexual men. The only people who assume that TIMs are mainly gay men are those who've not looked very closely, and have not met many of these men.

the orgs in question did allow themselves to get captured and invert their original purposes and turn their backs on gay people all while pretending to still represent us and now silencing us and our straight women allies.

This happens in revolutionary movements all the time, as what occurred in the Russian revolutions well illustrated.

Still, your claim that orgs and individuals "did allow themselves to get captured" doesn't sit easily with me coz it puts ALL the emphasis - and ALL the blame - on the captives and puts no blame on those who marched in with their weapons, aggression and conquering mindset and did the capturing. Would you say the native peoples of the Americas "did allow themselves to get captured" by colonizers of European heritage? Do you say the people of Poland "did allow themselves to get" invaded and taken over by the Nazis and later by the Soviet Union? Would you say the people of Cambodia "did allow themselves to get captured," enslaved and killed off en masse by the Khmer Rouge? Do you think the Uyghurs in concentration and forced labor camps in China today "did allow themselves to get captured" by the CCP and therefore the world should turn a blind eye to their plight?

Sounds an awful lot like the blame that was often heaped on European Jews after the Holocaust - anti-Semites used to say the Jews had their persecution and genocide coming coz the Jews didn't foretell the future and thus didn't arm themselves and fight back sufficiently,. Instead it was said they went like silent lambs to their slaughter. Which puts all the blame on the Jews, none on the Nazis and all their collaborators. And it of course completely ignores that the Jews did resist and fight back in many ways, which is why some survived the massive efforts to eliminate them all.

A principal reason gay, civil and women's rights orgs in Western countries got captured by the T is largely the result of capitalism and fear of becoming obsolete - the leaders and staffs of these orgs were willing to jump on the next bandwagon, whatever it might be, in order to keep the gravy train of funding and attention going and so they would still appear to be of use and relevance and to be backing a trendy cause of burning import that the press and public would rally around.

There's an old saying that goes something like this: what begins as a worthy cause soon becomes a business, and then it turns into a racket. Nowadays, the/a main purpose of many charities and rights organizations in the West is to provide cushy, well-paying jobs, prestige, power and perks for the individuals employed by these organizations, not to fulfill their original missions or to serve the people they were initially set up to help.

Also, by embracing the T dominated by AGP straight men like Martine Rothblatt, Chuck Charlotte Clymer and Grace Lavery, gay rights, women's rights and civil rights organizations have become men's rights organizations dead set on rolling back rights for women of all sexual orientations. This suits the people who work for and set policy for these orgs, coz whether they are male or female, gay, straight or bi, many people today - especially "activists" and "progressives" too young to recall the politics and events of the 1960s, 70s and 80s - are misogynists.