It is a fruitless endeavor. Shared the word and then leave and then say a prayer. That's all you can do for them. 99.99% of the time they will not only reject his word but they will attack you as well. Asking them to see the truth and wisdom of God's word is like asking a blind person to point out a color on a color chart. They just can't do it. Engaging them doesn't bring out the best in me, either.