We should all be on our knees asking God for forgiveness and then for new grace to live a life full of His spirit, which life will display more and more right things, and fewer and fewer wrong things.
I’m not surprised to see big mainlines get corrupted first... and it’s for the same reason that the big Roman church has. The big mainlines thought that in an institution lay bulletproofing. “Little” evangelical/Protestant churches such as Baptist, and indie versions of Lutheran, Methodist, etc. tend to see a smaller frequency of such corruptions. They have to be serious about the Lord or else they go extinct.
Power corrupts...
Absolute power corrupts absolutely...