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Well what's the worst is when people feed the animals. When animals start to see people as food sources then they'll actively follow them around and expect to be fed, and if you try to shoo them away or don't feed them it only encourages them. In some places I've been harassed by ducks, goats, etc. and the rangers say that people have feed them too much in the past so they learned to think of people as sources of food.
Deer are very adaptable and, when we destroy their habitat, they start living among us. I lived in a city where deer were everywhere, nobody fed them, and they boldly walked down main street, hung out in parking lots, raided trash, could jump any fence and strip your garden bare, etc. And, yeah, if you messed with them they would kick the crap out of you...