Tbh, in the current system (which is bad!), they are the "smart ones".
You have Alice, Bob and Charlie. They all earn the same amount of money.
Alice decides to take a loan and buy a 200k house. Bob stays at home and invests in stocks. Charlie stays at home, and puts the money in a savings account.
10 years go by, alice paid off 100k of the 200k loan, house is still worth 200k, bob has 100k of stocks and Charlie has 100k in the savings account (let's forget about the interest for this example).
They are technically all worth the same, just that their money is in a different form. And then one day, they all lose their jobs.
Alice gets social benefits, one time extra monetary help, loan refinancing and/or even a loan freeze in some cases, Bob gets nothing and is told to sell the stock (even if it's a bad moment to sell), and Charlie gets laughed at the social benefits office, because he has 100k in his account.
This might be our (slovenian) speciality, but the system is made to fuck with people who live responsibly and to always 'save' the people who spend all their money. Also houses are almost literally untouchable, even if you're a single person in a ~1mio city center apartment, and could move to a smaller one a bit further from the center for 150k.