I would agree with you if you replaced every "investing" word with "speculating" or "gambling". Otherwise what else am I suppose to do with my money but invest it? Leave it in the bank so they can profit off of it? There are entire categories of equity with variable degrees of risk, and a lot of them won't make me "lose every cent" in any situation but the end of the world.

You are erroneously conflating investing with gambling. Astute investing in index funds is essentially risk-free if your retirement is far enough away. As you get closer to retirement, you should start moving from funds to bonds (or cash if you want to be extra safe), so you are protected in the case of a crash.

I am not OK with losing the money I have invested, but it is so unlikely that I do not need to worry about it.

A situation where the global stock market crashes, and never recovers, is basically an apocalypse. That is not worth planning for.

You can not not invest „money“. If you let the „money“ exists in Fiat money form your money is invested in this exact fiat money.

This is all a big gamble with different risks. But generally: if you have “money” you have a risk to lose it.

I use here ““Money”” as a synonym for buying power, or value that can be exchanged. So it is not like Money because it dose not describe the meta value and is part of the big gamble ;)

But there is a risk in not taking risk too. If you had taken this advice over the last ten years (my grandmother did, for instance) you’d have missed the greatest decade in stocks and property for many years, and are much poorer because of it.

I had an economics teacher who very interesting and he taught us exactly this. He also actually owned a shop, so every economic theory he could explain with a real world example.