Taking into consideration that there are only about 400,000 or maybe 500,000 foreigners living in China we can still assume that there
would be a certain amount of pedophiles living within that group.

I think the real problem however is the amount of pedophiles living in the native born Chinese population.

Those Chinese pedophiles as the OP stated who travel to places like Cambodia and Laos to have sex with young boys and girls.

I would agree with you that overall that majority of ex-pats living in China, Thailand, Philippines etc are not involved in pedophile activity. It is more the local native born men and women who are involved.

In some places like Pattaya pedophile activity has almost been wiped out over the past 10 to 12 years and that's a really good thing.