Like most other creatures, wasps need food, moisture, and shelter to survive. So, they are likely to nest in places they can find all three of these things. Unfortunately, your home or business meets these criteria.
Since wasps are tiny, a little bit of these things are all they need. A tiny amount of sugar, such as a few drops of soda on a wastebasket rim, can fuel an entire colony for months. Furthermore, a bit of standing water or mud allows wasps to construct elaborate and sturdy nests. Finally, partial shelter from the elements is more than enough for most wasps.
Generally, even the most aggressive wasps do not attack unless they are provoked. Unfortunately, to a wasp, pretty much anything is provocative. Venturing close to the nest, maybe out of curiosity, is provocative. Running away from a wasp or a nest, which is a very natural reaction, is also provocative.
Wasps are capable of multiple stings, unlike spiders, bees, and most other insects. The stings are quite painful, especially for children. Additionally, many people have strong allergic reactions to wasp venom. Frequently, these reactions are life-threatening.