User blog comment:SolitaryReaper/Shepard in Javik's position/@comment-2127131-20120726081223/@comment-1679409-20120727070513

I think the question of vorcha and yahg aggressiveness diminishing is beside the point. Shepard is familiar with the vorcha and the yahg as they are today. His/her reaction is going to be based on that, regardless of whether or not those species mellowed out.

Plus, the vorcha don't evolve as a species. They adapt as individuals.