Unconditional love I believe is real, alive, and well.
The key is learning to GIVE it out. Measuring unconditional love by how much you can dish out, instead of "no one loves me" unconditionally. We have all been there, we have all been treated unfairly or had some sad poor story of being rejected by parents, friends, etc.... So yes, you can walk around and believe it doesn't exist, OR, you can choose to be the person that loves unconditionally. Measuring unconditional love actually by your own heart's capability of loving others.
Coming from a judgemental religion I still find myself judging people when I don't want to. Love is an action, you have to exercise it every day. It's not a blanket statement. It's renewable. Like you need to drink water every day, eat every day, exercise, breathe, you need to love every day. If you give it out, trust me people will respond to you in the same manner and you will find it.