What is your point with the last remark, out of curiosity? Estrogen isn't technically a 'bad' thing, but it is the female sex hormones, which should arguably not be consumed by men. I don't see the 'problem' you're referring to with abuse of the soy products, my point is that it's just not comparable to meat proteins because it's not the same thing. Soy products should be avoided for men while building muscles, etc, otherwise it's not a problem.
Soy products contain the same types of amino acids (protein building-blocks) that are found in meat, so while digested, it is effectively the same thing. Indeed they contain estrogen, like many other foods, which in non-absurdly-big quantities does not affect men's hormonal balance. My point was that it's important to diversify our sources of proteins, because besides proteins, they contain other types of nutriments of which it's important to eat a balanced amount of, and eating too much of one thing is always bad no matter what it is.