In general, if people are shooting outside in my neighborhood, I'd rather be woken up. That's not the type of thing that should go unnoticed. And I live in the middle of San Franciso where I've watched people get shot and killed.
I'm tired of being woken up way too early in the morning by gunshots. Waterfowl season started last weekend, so it was shotguns going off a mile away. Rifle season for deer starts soon (it's bowhunting season now), and that will bring its own set of loud noises from even closer.
I'm all for suppressors, if only so I can sleep past 5AM without having to keep my windows closed.
Out in the suburbs, or further out on the edge of the city where things start to get rural, if someone has a big enough backyard that they can safely fire a .22, I'd rather they use a suppressor. It's not a case of not being woken or not by the danger of violence in the neighborhood, it's a case of neighborly manners. It's more similar to me not running a guitar amplifier after 9pm. Nobody likes to be disrupted by loud noises when they don't need to be.