See that bike on the far right? The blue one? Yeah, parts of that have been disappearing for months. The bikes on the left, they are new to the fence and I don't think that's a good place to secure your bike. The library across the street may be a better bet.
A general rule with bikes, they are going to get stolen. Either in full or in parts. The District Curmudgeon caught a pint sized theif walking off with a wheel. I've seen boys, also pint sized, rolling around on seatless bikes (they sit on the rear wheel bike rack). And we've heard of bikes being stolen off front porches, back porches, back yards even while locked.
I've been lucky so far, I've had 3.5 bike stealing attempts made on my bikes in the DC area. 1st in Hyattsville from the back yard where someone picked away the covering of my U-lock. 2nd in College Park where I caught 2 guys with bolt cutters trying to take my bike from just outside my bedroom window. And 3rd time at the Mt. Vernon Square metro where the rear wheel of my 3 speed was bent almost in half. The ".5" was my roommate's bike. He left his 1 speed heavy rusty bike in the front yard, unlocked. I was in the living room watching TV when I noticed this guy lifting the bike over the fence. I yelled, ran out of the house and chased him. The bike was such a POS that the guy only got a few yards down the block before he ditched it and ran away from the crazy black lady.