If all you have to encourage people not to use those loopholes is an appeal to their morality, then you should not be surprised to find a bunch of amoral people and amoral corporations ignoring you.

The rich must be forced to do the right thing, otherwise they will not do it. Expecting otherwise is lunacy. Maybe one or two foolish and good ones will try to do the right thing, but they'll be swiftly out-competed in our hyper-efficient economy by those willing to break rules and cut corners.