BBC asking the important questions

Their point is to be the chads of insect kingdome

Their point is to point their point towards you.

They help with pollination, just like bee's and butterflies. Some even make honey :)

Predators. They eat a lot of mosquitos and flies. If you have a decent population of yellow jackets, flies and mossies won't be a terrible issue. They also have some pollination power, but not as much.