Zdad,
Before you said ” FYI Rav Tendler is not the only one who is against MBP, However it seems that in the more Charedi communities they are all for it and in the more modern communities they are against it.”
Clearly you meant that those were the overwhelming majority views of the respective communities.
Now you say that RCA does not represent all MO. But a significant portion they certainly do. They are clearly the leading and overwhelmingly largest Modern Orthodox rabbinic assembly in the US. Maybe they do not represent the Avi Weiss group. And not Tendler. But you are at a minimum being inconsistent. And more likely just farblundget.