A lot would agree with you, that the fear of increasing *corruption*, *iniquity*, etc. is recurring, oxymoronic, or something.
But consider:
I've witnessed Wilmington, DE and Philadelphia grow from *relatively safe* to crime-infested cities that really aren't suitable to raise families in.
Perhaps the same might be said of your experience(s) in London, I don't know.
I'm convinced (based on the evidence of increasing crime rates) that such increasing crime stems from increasing evil: i.e., "the lust of the flesh, the lust of the eyes, and the pride of life".
Another evidence: Increasing divorce in England and America with its devestating *corruptive* effects upon present and future generations.
Hence, it seems to me silly to think that jail has been abused or something by the USA; its crimes seem very real.
Note: I've visited (Boaz, AL) jail weekly the last few months and seen most are drug and alcohol related problems.