Soy proteins are an endochrine disruptor. They harm our hormonal system. The well known example of this is that some components of soy are so very similar in structure to estrogen that they are able to bind to estrogen receptors, and as far as our bodies are aware, they are estrogen and they do all of the things that estrogen does. This will be more harmful for men being flooded with basically synthetic estrogen, but I think it would be also harmful to women. Maybe their bodies will start making less real estrogen if they think it is already there, and all of these kinds of problems.
I am allergic to soy, I say luckily or else I would have been fed soy product milk replacement as a baby if I did not have the allergic reaction. Imagine how fucked up our civilization is and how harmful to our children, that infant babies are commonly fed actual poisonous and toxic things instead of milk. But this allergy or sensitivity allows me to feel specifically what components of soy are causing these problems, and it is mostly the soy proteins that are dangerous.
The soy lecithin that is used as an emulsifier in many foods does not seem to be very bad, at least in small amounts. I never noticed a problem from that. And soy sauce is fine because the way that it is fermented, all of the proteins are broken down into just amino acids and there is no actual soy protein remaining. But soy "milk" or tofu are actually directly poisonous against our hormonal structure.
I believe that soy is promoted so much specifically and purposefully as a biological weapon against our people to keep us weak, and with low testosterone. It is a way to basically paralyze and weaken large percentages of entire populations so we will be mentally and physically unable to fight back or defend ourselves if we have to. Look at Japan which used to be some of the bravest and strongest warriors, and look at them now with a diet with large amounts of soy.