I've had two vehicles broken into, in my driveway, over the past 15 years. And one at the curb in front of the house longer ago than that. I reported all three. And, yeah, nothing ever came of any of them, at least that I know of. But, I still figure that if everybody decided that they weren't going to report this stuff, thieves would have it even easier. If there's a rash of them, at least the cops know it's occurring. If there was a bunch in one night, or a big cluster over a few nights, maybe it would be worth their time to investigate?? But they gotta know to know.
The curb one, when I was much younger, I caught him in the act and chased him (unsuccessfully) for several blocks on foot. It was a '67 Chevy small window (neat old truck with a 283). My next door neighbor there was a deputy sheriff, and he gave me grief for chasing the guy. I was younger and dumber, but had already formed my opinion on criminals.