Imagine a scale, on one end is a market economy where the government does not regulate it in any way, and does not own any part of it in any way. This is pure capitalism/laissez fair capitalism, whatever you want to call it. And you are correct, it does not exist today in any country (and that’s a good thing in my opinion).
On the other end of that scale would be an economy that is completely controlled/owned/regulated by the government (for example, communism).
In economic terms, every country falls on that scale with some balance between a completely free market economy and how much regulation they impose as well as what kind of industries they control/own.
If someone is going to blame capitalism for “ruining everything” they are basically asking for a market system where everything is controlled/owned by the government. Where monopolies are rampant, and the citizens have no choice except for what the government or dictatorship has decided. In my opinion, this is also a bad choice.
If I am wrong about what they are asking for, feel free to point out the economy of a country that they are saying we should follow. In other words, if not capitalism, what are you asking for?