Truth is usually unpleasant, and most people will be in denial. They will find excuses to justify their shortcomings instead of facing the facts.
Most Sinkies are decedents of village folks from old China. The more refined scholars and land owners do not need to migrant. So obviously, today's Sinkie genes will be inferior compared with the PRC. On the hindsight, physical attributes was only affected and not mental capacity (IQ).