> it was just simply about those that (feel) benefited will defend the system while those that didn't (feel) benefited will attack against.

You can as well be benefited by the system while feeling like you're being oppressed by it, which I guess is what's going on here.
For example, people on state handouts trying to find work, but keep getting declined: "THE SYSTEM IS RIGGED AGAINST ME!!"
Or something more on topic, people on state handouts and being provided by parents, and all that might as well have mental issues, and will come to the conclusion that "money destroys everything", even though they get it all for free (not as much as if they had to work for it, but still).

> Why is it "the only"?

My observation of reality.
You won't see people in a 3rd world shithole saying "money is evil" and "fuck capitalism (or any other ideology/religion/cult)" all day long, you see this exclusively in the 1st world, where state handouts exist.

And just to make it clear, 3rd worlders neither defend nor attack (to put it in your words) the system, they have way more important things to do like survival.
And I've actually been to multiple 3rd world countries before.

> Also you can't eat money as food or for other practical use.

Unless you use food as your money (aka, bartering).
Because "money" doesn't necessarily need to be printed on paper or minted from metal, as long as the soyciety around you agrees on what money is, you can use it as a money, which is actually how it worked even before banks.

"I want 10 eggs" "I want the belly of a freshly hunted pig" "Deal!"
If you're the one with 10 eggs, then eggs is your money, and the pig belly is your product.
And the other way around for the other party.

That's why realistically, this whole idea of "abolish the monetary system" is purely a Marxist fantasy.
Even in places where they tried to abolish it, they soon had another monetary system in place, maybe not because the government didn't want to, but simply because that's how humans work.

> To eat (and do any other stuff) someone have to do the physical work, unless you exchange it with money.

And then the question is, how was this money obtained?
By physical work? White collar work? Somebody just gave it to you? By stealing? By trade?

> If money is evil (evil so that it should be abolished), can they achieve it without work?

I wonder if there are any cases of laziness paying off in the long term.
I don't mean things like "I'll build systems to automate the agriculture for me", but rather "I'll just sit on my couch and wait for an Amazon drone to deliver freshly picked food for me".