I presume there's some selection bias at work in the newspaper photography: the rich and powerful can wiggle out (h.t. Steve Sailer), but there aren't that many of them. And maybe brighter folks can figure some way to dispose of the awkward corpse clandestinely, though I haven't come up with any reliably untraceable methods myself. (Detective stories, looked at closely, aren't always very realistic.) But neither category should contribute much to the numbers, which leads to the banal observation the bulk of the criminals look neither very bright nor very attractive.
Maybe police photography uses the same equipment as the DMV, which generally portrays me as a felonious stranger.