I've only skim read it but that report appears to be saying the the gap between 'the rich' and 'the poor' is skewed somewhat by virtue of the fact that the top 1% are getting richer at a higher rate than everyone else.
If my relatively modest salary goes up by, say, 5% per annum, it doesn't make me any more or less happy with that rise if Richard Branson adds another £10m onto his wealth. Yes, the wealth gap between me and Branson grows but its a meaningless measure because I'm happy with my rise in the context of my earning potential.
Of course, if it can be proven that the top 1% of people getting richer makes 'the poor' poorer then that is wrong and my back of fag packet philosophy is perhaps open to ridicule. Fire away...