Though they know God’s decree that those who practice such things deserve to die, they not only do them but give approval to those who practice them. Therefore you have no excuse, O man, every one of you who judges. For in passing judgment on another you condemn yourself, because you, the judge, practice the very same things.

So: “they” are condemned for not only doing evil, but approving it.  “Therefore” you who don’t approve it have no excuse.

Paul’s argument is more complicated than commonly understood.

Would Paul’s readers agree they have done the “very same things”?