Lots of good answers in here already.
Some stuff that's colloquially seen as capitalism is okay. Me paying someone to clean my house because I hate that chore is fine with me.
It quickly becomes Not Fine when you add in all the "if they don't clean up my shit, they risk starving", "they work for a boss who takes most of the money I pay", and "none of us pay for externalized costs like using toxic chemicals for cleaning" parts. Other things too I can't think of right now n
Left alone, nothing stops capitalism from selling you bread made with sawdust. People might say "well the market would reject an inferior product" but that's not necessarily true. Monopolies and cartels form. People might not know a product is harmful until it's too late.
Blah blah blah. Fittingly, I have to go back to work now.