Looking it differently.
A parent ofc should love their kids unconditionally. See their faults and shortcomings. But that doesn't mean he shouldn't help them overcome these. Same with spouse. Failures and mistakes aren't there to be happy about them (well one can be happy for them to show what needs chiseling) but to learn from them and do "better". Because of the love the parent goes out of his way to help, and not leave them as is.
Well, if we suppose there is development, or it matters what happens with anyone, or how they fare.