Property developers have been activelly helped by governments and central banks for at least 2 decades who have done all sorts of things to rig the housing markets to always go up, even though to owner-occupiers higher prices are almost never a good thing (sure, the house is worth more, but if you try and cash it in by moving, any other house you buy or rent is also more expensive, so you gain nothing from your home having a higher valuation).
A guy his age has spent his entire life getting the message from top politicians and bankers that his economic activities are more important than just about all others and get rewarded no matter what (it really is a “no skill needed, just lots of starting money” domain), so it’s only natural if he behaves accordingly.
PS: Also, given that people keep reelecting the politicians who keep sacrificing the whole Economy (and keep selecting central bankers who do the same) to serve his interests and those of others in the same domain as her is, he probably thinks most people are morons. Worse, he’s probably right.