Like mentioned in the article, often times the material is very obviously suspicious and banks probably know this and still turn a blind eye to it because these borrowers are low risk and much less sensitive to the high/rising interest rates of today...
Eventually this behavior goes overboard and everything crashes. In the meantime, law-abiding people are screwed by the bubble. Then they are made to pay for the clean up.
Fraud is costly, and rationalizing it contributes to the problem.
Maybe... but you need to keep in mind most of these people are not really building a bubble. Unlike the subprime mortgage crisis, where things were built on inflated valuations, many borrowers in this "scheme" do have more than enough funds to cover the entire mortgage. It's just that their capital is relatively illiquid. This is also why the high interest rates have not significantly affected this.
The effects on housing cost is because of natural market merging where chinese properties are "overvalued" domestically. This is actually not new, and happened with Japan at some point as well.
That being said, the main risk for this is actually geopolitical... Should capital controls tighten (or, like, if war were to occur etc.) then there is a much bigger risk, but many are banking on the fact that, at least given the signs today, that is still unlikely.
No, I'd don't need to keep anything of the sort in mind. I've lived through multiple real-estate and speculation bubbles and crashes now. The arguments you make are the same sort heard before each one, and I can easily anticipate the rationales and excuses that will be offered after the next one.
You don't know how widespread this is. You don't know how many other banks are leaning on this latest house of cards, or how much of this is going on in the US and Europe as well. As far as the banks are concerned it's just one big world of suckers and they play these games everywhere, simultaneously.
And there is no "should." Capital controls will tighten. Wars will happen. Eventually, inevitably, the overhang destabilizes and this heinous crap will blow up.
Again.