Earlier quoted context omitted.
It's a moral argument against the inherent exploitation involved in usury. No one denies the time value of money, it's about how to extract that value morally and ethically, and not at the expense of the needy.
What are you proposing as a solution? Is this a situation along the lines of “Democracy is the worst form of government, except for all the others”? People with capital need an incentive to provide it to people without capital. You can argue reasonably that the distribution of capital isn’t “fair” but to argue there should be no interest charged seems irrational. Help me understand your position.
With lending money, there's usually a collateral involved. If the borrower defaults, then the lender simply comes after his property, taking more than what was originally lent, purely by the passing of time (which accrues interest).
When you read about student loans for instance, especially higher loans for people who go into law or med schools, how even after those people are employed and making good money, their outstanding amounts barely budge (or even accrue) even after a while. This is unjust, unfair, unethical, and exploitative.