Yes, I know they can be quite fleeting and the topic tends to change very quickly. Writing in a stream of consciousness is often to blame but also keep in mind that these are lyrics and conform to certain patterns that allow the vocalist to move fluidly through the instrumental. Love is an important theme that doesn't really seem to be put to the front of the priority list in society. Its a shame because so many of our worldly problems could be solved if people felt love for others.