No coyotes and wolves around?
Coyotes will take deer, but they're not that quick to target healthy adult deer. In the suburbs, they generally end up in smaller packs going after both garbage and scrubland prey like rabbits, so they're not an especially good check on white-tailed deer. (Wolves would be, but then they're not going to be allowed to stay in most suburbs.)
the degree to which deer have become comfortable around humans in the area in the last 5 years is incredible. I can be feet away from them on a jog and they won't flinch. I guess that's what happens when your only predator is a car