I excuse your ignorance. Capitalism is not trade.

Capitalism is a form of production where individuals or groups of individuals own places of production and employ people to produce for them for a profit. They pay you less than you produce for them.

Again, capitalism is not trade in and of itself. Trade has existed for millions of years. Capitalism has not. Capitalism is not trade.

I'm not a communist because I am an extreme altruist. I am a communist because it's the only way to keep society in check from each other.

If I own the food farms you need, you're fucked. I'm gonna be able to exploit you.

So communism solves that by not allowing ANYONE to own places of production of any kind. You can own private things (car, mansion, plane), but not public production things.

It is literally the only system that will put a permanent check on this kind of exploitation. Read Lenin's State and Revolution, this is literally what its about. Read Marx, this is what its about.