Careful there. You are not wrong, but you are not really correct either. Credit is a tool. Many people are using credit wrong and getting away with it because it is too easy. However that doesn't mean credit is a bad tool, just that it isn't used correctly.

Credit is a great tool if you get the value of the thing while you are paying for it. Paying for a car on credit (including insurance, taxes, fuel, maintenance...) is a great idea if you get the car payment worth of value (including what it does for your ego - if you are honest that is why you have it) from having a car every month , paying for a car on credit that you don't get the payments worth of value from is a waste. Similar for a house - I plan to live in this house for the next 10+ years, so I shouldn't pay for it all up front.

Most things though don't give value over time worth their payment. I don't get a payments worth of value from having gone on vacation a few months ago, so I should have paid for that up front (which I did but many do not). I like musical instruments, but I can't be sure to get $100/month of value out of my fumbling playing (or having them for my ego) so I won't buy them on credit.

You can't take it with you, so no sense in dieing with a mattress full of cash (unless that really is worth it to you). You should have some rainy day savings. Most things in life get value today only and should be paid for today.