I don't disagree with what either said, however...
1. So, Christians should abdicate any calling to serve in government or any civil engagement that advocates for any legislation that involves holding up moral standards? (including poverty/health issues)
2. Pastors should never preach a message unless they have a sign-up for those to serve in a homeless shelter that evening?

I will presume they would qualify their answers.
I grow tired of these "serve in the same way as me" experts.

I think you miss the point Chapp. Open commensality is how Jesus made inroads into peoples hearts and minds. If you read the bible closely sometimes people did not change their occupations regarded as 'evil' or 'immoral' by the moral establishment. As people of God our goal should be to make usher into community those deemed by society as other.
Now this doesn't preach well. It is a challenging thing.But our ability to love those who other cast away where they are. Our ability to bring forth justice that is God's kingdom into reality we will create a world more redeemed.
Remember Paul is not God or Christ. The Epistles and Pauline letters are not Gospel or the words of Christ.There are the Church's life in Christ which consists of imperfect people.

I think this is what is wrong with today's "evangelical" church. And yes, I understand taking a moral high ground. But those that only accept the persons "they" approve is un-Biblical. The attitude I encounter most of the time is "if they are not like us" they are unreachable. Contrary to the application taught us by Jesus, "evangelicals" wish to be set apart from, not witness to, sinners. I see within the "evangelical movement" a return to racial segregation and intolerance based on fear. I teach a bible study at my church. I am baffled by the unengaged nature of my students. They have no desire to follow the teachings of Jesus that make them feel uncomfortable. "All" have fallen short, not just the churched. "All" means "All", not some.