The problem is that those who don't have, assume being the boss of your own business means sitting by the pool with your beverage of choice all day (as seen on TeeVee!).
Those people have never built a business, have never taken the risks, put in the 15 hour days, spent their every waking moment making it work, keeping it going working with customers, the taxman, vendors, the taxman, accountants, the taxman, employees, the taxman, and every other time consuming and stressful duty needed to make the business viable and make it grow.
There are plenty of sacrifices made to get it going, keep it going, and the biggest one is time.
Time spent not doing things with family, missed occasions, "rat stomping" events that pull you away from family at the worst possible times to fix a problem.
That directly affects the heirs, usually offspring or spouses, whether or not the people who think it takes a village to raise a child think so. Everyone gives up something because running and growing a business isn't some leisurely act, and not even just a 9 to 5 job.
So it is easy for those who do not understand all this to believe that some magic 'wealth fairy' just anointed their heads and made them rich because they like the way they look, but that just isn't how it works.
Even their heirs, progeny of those encumbered by yet more government confiscation by a government that rewards the success of its citizens by removing a higher proportion of the fruits of their labors, will have to apply themselves, educate themselves, and become proficient in the business--or in just managing wealth--in order to maintain or grow it. The alternative is that the business will be fail or sold to its competitors for a fraction (often) of its worth and the money likely squandered.
So, generating and inheriting wealth comes with sacrifice.
The taxes have already been paid on that income, and in their own way, the heirs made sacrifices for it to have been made.
The Government already got its cut.