> I think it is wrong because the people advocating cutting the pie differently are not poor,
You mean, the people who are advocating for taking someone else's pie.
Where does this idea come from that the rich are "taking" from them? No one takes from you, except for the government when they collect taxes. All other relationships are consensual relationships negotiated by people who are all looking for the best deal they can find. Someone pays me for my labor, and in return for compensation I give them my labor. It's a fair deal and entered willingly. If I did not think it was a fair deal, then I could offer my labor to someone else and look for a better one, or I could start my own business and work for myself.
If you think that someone else is taking from you or paying an unfair price, then start your own business. You might end up with a different perspective on the value that business owners and capitalists have in society. When you start a business, all of the wealth you create is done with your own hand: you provide a product or service, and you convince people to give you their money in exchange for it. They do, and (hopefully) you end up with more money than it costs to create the product or service, and so you profit. The difference is, no one is taking care of you by saying, "Hey, just come into work every day and we'll pay you." The business owner needs to make sure its suppliers deliver product on time, and its clients pay what they owe on time, and handle various sorts of concerns that are easy to fail to recognize. The business owner needs to make sure their facilities are operational, and that laborers have the tools and supplies they need to do the job, otherwise work stops! There's a chance that your business can crash and you'll be left with nothing. You take on a risk that you work for years and end up with essentially nothing, because your company might be running out of money, and no one might be willing to buy your (at that point) failing, borderline worthless company. There's a lot of risk involved, especially in companies that develop new products -- the value of the product isn't known, and so you're taking on a risk that the company itself might collapse due to being immature, and a further risk that the product might not be valuable, and many more risks.
If anyone be believes that they or someone are "not getting a fair cut", then they are welcome to strike out on their own or with like minded people and create their own organization. This website frequently writes about organizations that were created by just a few people, delivered incredible value, and so grew into something great.
Furthermore, if this company founder is correct in their theory that organizations that employ laborers are not giving the laborers a fair share, then the new company that they found will be able to and will choose to pay laborers much more than any competitor will (due to recognizing their true value). In paying more for the labor, this company will be able to attract by far the best laborers and hire as many people as it needs. Competitors meanwhile will be starved for talent and will suffer. In this way, a company that fairly values and fairly compensates the work produces by its laborers will out-compete companies that undervalue their laborers. In the end, companies that value worker labor correctly will come out on top.
If you have studied economics, and you have followed this reasoning, then you should be open to the possibility that laborers are in fact fairly compensated for the value they produce. That's not to say that we should not have progressive taxes, but when you recognize this, you might look differently at the idea that peoples' value is being "stolen". They're willingly trading it at a price they negotiated. You shouldn't be sour about a deal you negotiated and accepted; and you shouldn't be mad at someone that a better deal isn't available. Perhaps I think I should be paid $1 million dollars per year, but just because I believe that doesn't make it true. A person deserves to have the compensation that they earn by providing value to others, at a rate the other people agree to willingly (and enough to say alive, whichever is greater).