I'm not Frink, but it bothers me some too and here's my two cents. It's not the picture that's offensive. It's the usage of it as a pro-life statement. The avatar in this case is meant to represent the person's beliefs, and therefore, advocate for them. Though more of a positive reinforcement than some pro-life advocates I've seen - for example, Earth Day pro-life protesters used blown-up pictures of dead fetuses in San Diego, and it was uncomfortable to walk past and out of place at the event - it's still a misplaced emotional appeal.

Just my two cents.