Because someone might put in an image that is copyrighted and not being used with permission or inappropriate. We don't have the time to chase those down to make sure we're not using something that shouldn't be here and have Steve be the one who gets into trouble for it.
Walk a mile in my shoes...
It's only logical:
The previous post by Snaggletooth was asking about avatars. Oh Lordy I do crack my self up sometimes!
It made me a little sad but I didn't want to get our favorite writer in trouble over kittehs! I wasn't going to fuss but gosh I can hear it now.... Why does Stephen King hate cats?
Hindsight is 20/20
Must have keen fashion sense