Why didn't a concept like "pointers" in Computer Science evolve in the genome?
Short answer: Pointers already exist within the genome, in terms of transcription elements (such as repressor/activator systems). These systems can remotely activate a specific gene for transcription based on concentrations of specific chemicals within the cell. 

The problem with LINEs are that they are thought to be ancient retroviruses which lost their capacity to infect other cells, instead jumping around within the genome. They are therefore parasitic in nature, and they reproduce by inserting multiple copies of themselves into the genome. It makes more sense to think of LINEs as nearly inactivated retroviruses instead.