As others have mentioned, it is probably more about the levels of income inequality that concern many, given that such will probably always exist as the variability in human abilities, ambitions, and opportunities will tend to increase the wealth of some over others. And this will be so unless we somehow see cloned humans in the future, and as to which no doubt many of us would be rather alarmed. But wealth inequality has been tied to higher levels of crime - and not so difficult to see why this might be. Having great wealth tends to afford one more privileges too, whether deserved or not, and it's not hard to see such in action - whether as to self-promotion (in politics, for example), controlling the media (by owning such), as to evading justice (even if the latter might just be evading taxes), or as to establishing dominance or monopoly in any particular area, amongst so many other benefits.I've always considered it as practiced in the United States to be a good thing. But I know a lot of people seem to think it is bad; why?
K
Personally, I have an issue with wealth going to individuals rather than the workforce that mostly produces such wealth, and where the luxury lifestyle often coming from such wealth is more a waste of resources when such wealth could be spread more evenly and more wisely. One could cite the trickle-down effect but I think that is mainly a red herring, as it is in general a bad economics argument.
So I'm not against income inequality in general, just the effects of such being too high as costs to society, and where the notion 'because I'm worth it or I deserve this' just seems so fallacious - especially when wealth is inherited. However they get to the top of the wealth pile most of these individuals are definitely not that much better than so many others, and it is often circumstances as to why they have such wealth. And the jealously or envy of the rich thrown at the more socially minded is usually just ludicrous, given that so many of us just don't want such rich lifestyles - when it degrades so many others in the process - that is, that we have a reasonably worked out morality system.
The inequality effect might be typified in the last several decades as to why so many 'celebrities' (and gaining wealth simply from this) have been virtually created mainly due to their exposure on any media, and as to so many having little merit at all in reality.
Lastly, I am suspicious of the notion that we should own every thing or even any thing. It's pretty obvious that we all (me too) subscribe to this, but in earlier times when we lived in much smaller groupings, this tended not to happen, mostly because there wasn't much to own and secondly because the group survival was the most important thing - so everything was shared. Over time we seem to have lost the sharing aspect in favour of owning virtually everything. Perhaps we are due for changes in the future - if we make it through the current morass of squabbling nationalities, incompatible beliefs, and enormous wealth differences that tend to divide us. But such won't happen if greater wealth inequality increases as the trends indicate.