Romans 1:32

Although they know God's righteous decree that those who do such things deserve death, they not only continue to do these very things but also approve of those who practice them.

(v32, NIV)

So far we've seen different ways in which we go from bad to worse. There is the wrath of God that is upon us for our sins, and God giving us over to the lusts of our hearts. However, coming to the end of the chapter, we get to the worst part. It's gotten so bad that not only do people do these bad things, but they approve of others doing these bad things. So not only are we sinning against God and trading away his glory, we are encouraging others to do the same. We are helping others participate in our worship of everything that is not God. It's disgusting and the worst we can get. Not only are we affecting ourselves, but we are affecting others and helping in their downfall. It's bad enough that you're causing the downfall of yourself, but you don't have to drag others down with you.