Triggers something: I have read a book once where I stumb…

Triggers something:
I have read a book once where I stumbled over a concept with regards to "uncoditional love".
In the book "uncoditional love" was reserved for children only.
Because a child may have to learn certain ethics and lessons.
Like not pulling out a flies wings to make it more human like.
You still love the child, even though it may have done something bad, because it did not know better.
The older you get, the more lessons you should have learned and the better your ethics should have become.
And not just through experience, but also through theoretical learning and observing others.
One of the best ethical guidelines for me is "Don't do to others what you do not want to be done to yourself".
But giving a rapist or murder uncoditional love, even after the second or third time wouldn't be a good idea in my opinion.
From a universal/wholistic or probability point of view I understand the inevitability of those actions.
And I may accept them.
But I would like to have this person jailed up or something similar.
So as long as "uncoditional love" is not synonymous with "no consequences for every behaviour" I would agree.
I want to add, that the book stated, that when you haven't experienced "uncoditional love" as a child, and your parents love came with conditions, the majority won't be able to make up for that when grown up.
They are on an endless search for something which is normally granted to children only, for the reasons mentioned above.
Granting it to grown ups probably would end up with moral and ethical decay.