Is it normal to believe capitalism cannot work because of the people?
The main problem with capitalism is that it gives the average consumer too much credit. The capitalist ideal is that the market will gravitate to the best products at the most reasonable prices. In practice, this is clearly wrong as we see bad products become more popular than objectively better yet cheaper ones, and as good companies are buried by corporate cults of personality. The fact is, you can't trust people to know what's good for them. It's unwise to continue to allow people to make these kinds of decisions for themselves.
Yes, you could boil it down to saying that I'm claiming people should have fewer rights because they're stupid. But think about this... Are you really doing them a favor by disagreeing, which can only send them further down this spiral?
Socialists often claim that it's a capitalist lie that capitalism rewards intelligence. Actually, it's entirely true, and it's exactly what's wrong with capitalism. It rewards a rare trait. Still, socialists are trying to make a better tomorrow.
The reason capitalism exists is because of the idea many people have that freedom is always a good thing. They see nothing wrong with normal people having a part in the economy. We need to leave behind this thought that we should be free in all parts of our lives. What will make things better of all of us isn't freedom of choice, but freedom FROM choice. If you haven't accepted that sometimes people are better off when you give them less freedom, you need to really think about how your views affect humanity.