Why should somebody be taxed higher because they are fortunate enough to have a nice penthouse overlooking the sea than somebody who doesn't live the life of luxury. Thats not social justice its an attempt to punish the rich for being rich while the rest of us are not... envy. You also can't tax somebody for having a yacht, they pay their taxes on it when they purchase the thing and they pay harbor bills you can't tax them for owning a yacht ... typical socialist thinking, so you don't have wage gaps and you don't have one side living in luxury and the other struggling to get by so make the rich poor so we are all equal.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Social justice also means ending the occupation