When my $500/month student loan payments kick back in, you better bet I'm not going to be spending that $500/month on toys. This is about absolute dollars spent.
It sounds like you're mad that you voluntarily took someone else's money and are expected to repay it? Of course, if you take a loan, you'll have to make future financial plans to budget less for frivolous expenditures
I'm not mad about anything, or arguing policy about student loans. I'm just stating a fact - spending will decrease when people have less cash to spend. Why is that controversial?