It's quite legal to marry a 12 year old in some states in the US and over 200,000 thousand have been in the last 15 years, mostly girls to older men. When your moral compass is that corrupted, I guess to a large part of society imprisoning children doesn't seem so appalling.

It's difficult to comprehend such depravity as part of a society, and perhaps that's why some US citizens see guns and executing mentally ill people as mere trivialities.