Hundred fifty three

I love observing monkeys. They jump around and kind of pest in the urban area. In the forest, they have to forage from morning to evening to get enough calories. In the city getting the calories is very easy. The rest of the time is free for having sex and gang wars. Because of the high reproduction cycle, the group size expands rapidly. The alpha male fails to control a big group and soon young males try to form new groups. 
Do they have a purpose? Do we have a purpose? Or for things we do and create we call it purpose? As a social animal, we moved to a different level in the life. But do our brain got enough time to evolve and adapt to our newly created world which is so different from forests and grasslands.