[dekhn]

anyway, if you're really so hung up on this, let's drop the viral intermediate and focus just on pseudogenes (instead of viral retropseudogenes), which are exactly the thing I described in my first comment.

http://en.wikipedia.org/wiki/Pseudogene#Processed

so, if you want to demonstrate your claim, you would need to write a script that showed that there was no pseudogene that ever inserted at a nonspecific site. You can't show that. ergo, my proposal is more likely than yours. Further, it's support by evidence- for example, the genome is studded with p53 pseudogenes that reintegrated from cDNA nonspecifically.