1) Increasing inequality of social power between the mega rich and the common person
2) A feeling of unfairness as business leaders take home the lions share of profits
#1 is a true issue, but, let's be honest here, the average CEO's level pay isn't contributing to increasing inequality. That McDonald's CEO had a yearly take home pay of 21.7m. That's unbelievable peanuts compared to the wealth of the mega-rich. It is the multi-billionaires flexing their political muscles and exerting influence that leads to the nasty consequences of pay inequality.
As to #2, I understand the unfairness, but fail to understand the social consequences of it. In other words - what harm to society is being done by a manager getting paid more than a line employee? You mentioned offshoring jobs, but that is a separate issue, not tied to pay inequality.