I have been associated with many religious groups over the years, mainly the Catholics, Jehovah's Witnesses, and various evangelical born-again groups.
What you are seeing is a normal mindset with many religions. If a person is content with their religion, it will take a lot to move them from that contentment. Most will happily ignore problems with their religion. This is not necessarily wrong or unethical.
Plus, most religions teach their followers not to really think logically about their beliefs. Hence, the teachings on "taking things on faith", "holy mysteries", etc.
I replied that he could be considered guilty through association for the wrongs, lies, and such that the Witnesses are going along with. He said it really didn't bother him.I disagree. Part of my taxes pay for the military. Does that mean I am partially responsible for killing people?
Your reasoning is similar to the JW reasoning that if you give only a dollar to a union or to buy a military surplus truck, you are contributing to union violence or the killing of people. That thinking is just too extreme.
And yes, I know that "every snowflake in an avalanche can say its not responsible", but there is a balance somewhere. Its not like your friend was part of a JC that is hiding a child molestor.
Richard