You’re sympathising with the rapey male guppies? Really? After the research found the barbs explicit purpose was for mating with only unreceptive females, and that the male guppies have no problems mating with receptive ones?
Good grief. Rape, here, is well an example of a ‘nasty natural’, but it doesn’t make it needed - as you seem to imply - much less defensible.
On that note, surely it’s not hard to have empathy (or, at least, sympathy) for female guppies over the males in this case, is it?