Perhaps you are being deliberately obtuse I'm not sure. The point the poster was making is that the US happily arrests foreigners who set foot in the US and regardless of your guilt or innocence you get trapped in the US justice system which is essentially a system to tie you up in court and legal processes that you cannot afford so that you accept a plea deal, possibly for something you have not done, because otherwise you face never seeing the outside world again. The US justice system then acts like the guilty plea is enough to warrant their behaviour even though many times it is accepted by the defendant because they have no other options.

This also applies if you are a poor American citizen, the rich can buy their release with sufficient payment to lawyers, plus the courts tend to be more lenient on the rich over there, especially if they are white. Rich coloured people have a tough time because the justice system likes to make examples of them and claim the example is being made because they are rich and not because they are non-white.