I have no doubt that a lot of parents have that "my little angel" syndrome that keeps them from disciplining their children, but notice how that doesn't free them from the responsibility nor allow them to blame their kids.
I can appreciate that I was really fortunate to have parents that put in that sort of effort. My mom would also cut up vegetables like turnips for us after school that we would scarf down. They set me up for a healthy lifestyle as an adult that didn't take much effort on my part.
I know a lot of people didn't have those kinds of advantages, so they especially don't come naturally for them once faced with raising children and having to make those decisions themselves.