The capitalist system has always relied upon exploiting resources to keep the flow of capital within the community. It is this need which drives some historians to propose Empire building, invasion of neighbouring countries, is a capitalist venture. And before you suggest other regimes have done the same, let’s just say the economic system is capitalist whatever regime is stuck on the top of it.
This continual consumption cannot continue in a finite planet so we are looking to mine asteroid and meteors and other planets. In other words to keep the system we need to increase the available resources.
In the meantime the available resource that presents itself is humanity itself. In the same way that money makes money, so the system created to benefit making society work, now feeds off the instincts of the population. The baser the instinct, the more secure the cash flow.
Welcome to the 21st century.