The way I see it is it's either for A. public shaming or B. Reinforcing preconceived racist notions. (The latter of which I see is shamefully prevalent in ADN comments) 

The press releases mugshots for a reason, they can legally confirm without liability that the person in the photo is who they say they are. Posting an image of someone and linking them to a crime can have extreme ramifications. Some facebook internet sleuths were trying to play detective with some security camera footage of a store that got robbed in Alaska and were linking to my facebook account because I shared a same first name with a suspect and had a passing resemblance. I ended up getting called down to HR at my employment the very next day. What if I had a job interview and my face is popping up on social media linked with a crime?

The press crawling facebook accounts for pics only based off a name is no different than this.

Due process exists for many good reasons, and it should continue that way.