Probably to make the distinction between prepubescent children and those who are physically capable of reproduction. Whether is should be any distinction is certainly a valid argument, but there is still a point to be made. A degenerate who gives into their base animal instincts and views someone of child bearing age as a valid target is slightly better than a degenerate who is attracted to something they can't even reproduce with. Though this is more of a philosophical and psychological thought experiment, like I said disregarding any pedantic difference is probably for the better. At least so we can reverse course on the downward spiral society is taking.
Why only children under 12?
Probably to make the distinction between prepubescent children and those who are physically capable of reproduction. Whether is should be any distinction is certainly a valid argument, but there is still a point to be made. A degenerate who gives into their base animal instincts and views someone of child bearing age as a valid target is slightly better than a degenerate who is attracted to something they can't even reproduce with. Though this is more of a philosophical and psychological thought experiment, like I said disregarding any pedantic difference is probably for the better. At least so we can reverse course on the downward spiral society is taking.