Well, it's not like we can shoot them and eat them. It's illegal to fire off guns, crossbows, etc in the city. The houses are just too close. If you miss, you could kill someone by accident... Happens more than you'd think. So they just kind of domesticate themselves. It's a fascinating evolutionary experiment in a way. Kind of shows you how wolves could domesticate into dogs. They just stick around long enough and stop being scared. Then they get friendly. Next thing you know they're playing with you and eating out of your hand.
For a while there were a lot of traffic accidents. You'd see a lot of dead deer each year on the side of certain roads. But they adjusted to that as well. They don't cross if a car is there, and they cross fast as big groups, never individuals. I haven't seen a dead deer on our local heavily wooded road in years. (Could be the city got better at removing them fast, but if the rate they preform other services is any indication, I doubt it.) I have seen the exact same deer sometimes going on years, wandering around. We have this one small buck that got hurt as a fawn and has a limp. He hangs out with a posse of bigger bucks most of the year, and wanders off on his own during rut for a couple months before joining up with his buck posse again later. I see him limping around just fine year after year. The deer are very laid back so he keeps up with them 'cause they move so slow. Nothing wild to eat the deer, so there he is. This bucks been around some 5 odd years now. He'll probably die of old age before anything else.
You can't even put a plant on the porch without them eating it. My sister had a big dog that would bark at them through a ground floor window while they ate the daylillies planted right below the window. Nothing grows here without a thorough deer inspection, especially in winter.