This type of thinking is pure toxin because it essentially reinforces exactly what you don't want.
If Peter did in fact work hard and now he's stripped of the results of his labor while being told that probably he only managed to accumulate capital because he was just exploiting others, what incentive landscape does that create.
Is a lot of profit a function of factors much less commendable than creating value for others? Sure. But by lumping in the productive people with the parasites, you are undermining those people who deserve your protection the most.