It's not even strictly what capitalism is about. It's some stupid bullshit interpretation that came out of the University of Chicago economics department.

Seriously, go look at Adam Smiths wealth of nations. The only mention of the "invisible hand" is so different from what is taught in economics now

… by directing that industry in such a manner as its produce may be of the greatest value, he intends only his own gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention.

It's not that we need no regulation. It's just trying to say that if we set things up correctly, we don't need to worry about people pursuing SOLELY their own personal gain. Because the market seeks out the "greatest value", which is not just about money. It's also the value to society as a whole.

Instead, we got the fucking bullshit from Chicago saying that the only / best way of measuring value is by profit.