Lets be clear; changes to tax laws do not 'force' the wealthy to leave the country.
The wealthy are choosing not to increase their contribution to the country they are (currently at least) living in.
Sure that is a choice they are free to make, but its their choice; no-one is forcing them into anything.
They already have enough money, so refusing to pay higher taxes is a choice about what they wish to support in their (for now) home country!
They are not victims!