It certainly is, in a nation with so much wealth it's shameful that it is distributed so unequally. For example, in 2015, the top 1% of US income earners, received 22% of all income - how can this be right, source: this infographic?
The problem is capitalism, which encourages the wealth of the few over sharing the wealth across “the many”. The issue has become tremendously worse over the past 4 decades and got even wider during the depression of 2008.
Until policy makers tackle this issue the situation will only get worse. We need tax reforms, increases to the minimum wage, reduced immigration, increased benefits, more regulation of certain industries (e.g. financial services) etc. These are just a few of the factors, it’s no one issue which contributes, its potentially hundreds, but in my opinion, the top 1% have a definite strategy of how they intend to become wealthier and wealthier at the expense of the remaining 99%.