Excellent thoughts above.
One way of affecting or altering someone's thoughts, especially someone who is just growing those thoughts, is to enlighten them, or expand them.
Never say that the other person (dad),their thoughts or actions ares bad, but give them "other info" so they can think about it on expanded terms and come to their own conclusions.
When it is their own idea, it sits better and means more.
Besides, although it doesn't ALWAYS work, when you are out there and your kid says. " gee dad, why are you doing that. . it doesn't seem right", it might make dad think about it too.
In all areas of life, some things are passed down. "We always did this", with no thought at all. But when you add some thought, it might not be as palatable and might change.
ChuckC