Hmm... they do, but this is actively incentivised with low interest rates, which directly inventivise borrowing, and also have secondary effects, such as easily available mortgages leading to increased house prices, which leads to further borrowing.
You can also see this in student loans. Sure, people volutarily choose to take them out. But this is because they live in a society where access to a lot of jobs is gated on having a degree, and degrees are so expensive that a loan is the only option more often than not.
