If death comes to all because all have sinned (are guilty of sin) then in what sense is a person born a sinner?

This text is from a transcript of a talk by David Gooding, entitled ‘God’s Power for Salvation’ (2005).

I would answer that by using an analogy. In Singapore dealing in drugs is a capital offence, and the mandatory sentence is execution. So let's suppose a woman gets caught. She is guilty; she's been dealing in drugs and is a drug taker herself. She is sentenced for execution in Singapore, but at that moment she happens to be pregnant. Now, the child is in her. Would you say the child is guilty of her sin? Would you say that when the mother sinned, the child sinned? I don't think even those who would execute her in Singapore would say that. They would give the poor woman time so that her child might be born, and then eventually the woman would be executed. They wouldn't execute the child because the child was in its mother when she sinned, when she committed the crime. That said, you will find when the child begins to grow up it can already have withdrawal symptoms because he has been injured physically by the drugs, and the child therefore is born with a tendency to go to drugs. Of course, the child eventually knows what the law is and what the law's sentence is. If the child, knowing all that, goes on and personally engages in drug dealing, that is another story. The child is born a drug addict, in the sense he is already affected by the drugs, but he is responsible for his own deeds, and if he goes off and indulges in the drugs he will be sentenced and punished by the government.

That is a crude analogy. As I understand it, we are not condemned because 'we sinned when Adam sinned', because we were somehow 'in Adam' or belonged to his sinful race. But, because we are descended from Adam, we have inherited from him a fallen nature which leads us personally to sin, and we do sin. We are born with a fallen nature. Then in what sense is a person born a sinner? 'By one man's disobedience we were constituted sinners' (see Romans 5:19), that is, through Adam's fall, all his descendants have been born with a fallen human nature. In that sense, all are basically sinners, like a tree might be an apple tree, basically, even if it never bore any apples. That is the reason, as I understand it.