It's not hard to understand, examples of this are laying all over the place.
People want things, all kinds of things. If you make laws that attempt to deprive people of things they what they do what they need to get the things they want.
As far as the OP is concerned, this to should have been foreseen (and it was) France and Kalifornia, everything that is happening has been foretold.
The rich are leaving the UK and France and Kali and NY. Nobody has a right to be surprised, it was foretold, and it is happening.
I wonder how the proggies try to explain the tax increase that Kali voted for and then come to find out that revenues decrease...I mean how the heck does that happen!?!