The chorus of Katy Perry's song "unconditionally" is written in the future tense. "I will love you unconditionally." This implies that current circumstances preclude love. In other words, her love is subject to conditions.

She goes on to suggest "open up your heart and let it begin."
In other words, her love will become available if and when the subject decides to receive and/or reciprocate it. This sounds like the opposite of unconditional love.

She also repeats many times "there is no fear now." Irregardless of whether she is referring to herself or the subject of her affection, it sounds like there is in fact a lot of fear insecurity and reluctance on both sides. Perhaps this was supposed to highlight the wishful thinking of a person in this situation. Perhaps this whole song is a sardonic analysis of unhealthy, obsessive, unrequited love and how difficult it is to be objective under these conditions. Or maybe Katy Perry doesn't care that her young female fan base will listen to this song and see nothing unreasonable about it. Or maybe it's like the movie Shrek where it's fun for the kids but also has some elements that only adults will understand. Maybe Katy Perry is a gifted lyricist allowing millions of people with different amounts of life experience to listen to her songs and all hear a different message. Maybe the apparent banality of her music actually allows it to function as a sort of mental mirror, forcing people to confront their inner most thoughts. Maybe that's why her music is so popular, because everyone hears it as a harmonious duet between Katy Perry and themselves. Maybe Katy Perry is like a cool kid that's introducing us to ourselves, telling us that we're cool too. Maybe, all of her listeners, whether fans or not, have been enriched by her music.

Or maybe it's just ****** pop that has been marketed very effectively.