The "distribution" doesn't just "become heavily lopsided." It is caused by something or somethings. One of those things is the unwillingness of many to provide for themselves, believing that by their very existence they are entitled to have others provide for them. Another is that while we are all equal in the eyes of God, some are born with, or otherwise develop, skills that others do not have.
The fact that some have more does not mean that it was taken from the hands of those who have less. One can simply observe that people (and not just Americans) have a much higher standard of living than those of just a generation or two ago, including those who live by the (confiscated) wealth given to them by government.