Troubled children buy lots of stuff to compensate. Good for capitalism.
Individuals who never get married can tend to be materialistic and fill the void with lots of purchases of cars, jewelry, clothing, eating out, etc. Good for capitalism.
It definitely is a good strategy for an individual to get married and have kids, but what makes sense for the individual is not always what makes sense for the market.
Why do you think companies build products to fail after a few years? Is that good for the individual or for the company that wants to sell them more crap?
Why are there so many restaurants (or used to be before the lockdowns) when it makes more sense for people to cook and eat at home? Why Starbucks when you can make yourself a cup of coffee at home for 25c or less rather than $3 or more? Why do mortgage brokers encourage people to get loans for more than the value of the house so they can do immediate renovations with marble countertops and stainless steel appliances?
The market needs an ever increasing pyramid of people to feed the Returns On Investment necessary to keep the stock prices up and rising.
If the population ever flattens out or starts to decline then they will have to get each person to buy even more crap. That's why both the Dems and the Pubbies are in favor of mass immigration because they know the system will fail with the current birthrate among citizens.
Also its a very hard sell to get older people to buy more crap, which is probably why healthcare costs are so high. You can't get old people to buy Porsches and pearl necklaces, but you can get them to spend thousands to keep a little bit healthier and live a little bit longer.
Wow you have a very skewed view of capitalism.
Capitalism rewards thrift, industry, innovation, honesty, and hard work.
Divorce impoverishes people.
Capitalism does not have an official position on it any more than any other economic system does.