First of all, let's define what profit is. Profit is, in simple terms, revenue minus expenses, and understanding this makes it clear as to why profiting off of workers is theft. Let's say that we have a business. It makes P profits, which is based on the business's R revenue minus its E expenses. One part of the sum of expenses is the workers' W wages. But where does R come from? The workers, of course. They produce virtually 100% of revenue. If they all stopped working, the business would make no money. So if the workers' labor is worth R, why do they get paid W, which must mathematically be significantly less than R to turn a profit. Logically, they should be paid the value of their labor (R) minus the expenses necessary for them to produce that value (E). But where does most of the after-expense revenue go? The owner of the means of production. They take their workers' labor value and dole it out however they see fit, undoubtedly giving themselves a greater piece of the pie. In most circumstances, taking more than your fair share is considered stealing, especially when your fair share is little more than 0. Some might say that their inordinate compensation is justified because they own the MoP, but that just makes them middlemen. As stated before, if the workers all stopped working, the business would make no money. However, if the MoP owners stopped owning the MoP, nothing would happen. That's since all that matters is the MoP itself, not whoever controls it. For this reason, it makes sense for businesses to be run more efficiently, either by leaving ownership of the MoP to the workers themselves or the government, which exists for the benefit of those it serves. This way, large swaths of after-expense revenue will no longer go to disposable and largely useless individuals instead of those who actually produce it.