Also, if you ever try to get involved in your local community, you will find that nobody really cares about you if they know you're going to be gone in a year. The people that have influence in the community are the folks that stick around.
We live in a very young-thinking age, anxious to throw out established wisdom and forge our own way. However, I fear that we are too eager to discount the wisdom in established wisdom. I'm not saying that we have to swallow it wholesale. But there's a reason it came into existence in the first place.
My peer group has no concept of "community". We don't belong to one. Or rather, we belong to a new one every two years, which amounts to the same thing.
We pay lip service to the ideas of helping our neighbors and building strong communities, but we have no idea what those words actually mean. We try to fulfill these ideals through national politics, but it's not the same thing as actually helping your neighbor, personally, in real life.
So sure, people need to rent and move around when they are young and finding their way. But eventually it's good to settle down and belong to a place. In the aggregate, it builds a stronger society.
I went to a church around here on Christmas (I'm an atheist, but I like the carols), and it was startling to interact with people outside my peer group. Some of the parishioners had lived in San Diego for decades. They had known each other for decades. They knew who had children, and who was elderly, and who was sick and needed help. They knew who was widowed and who had children overseas in Iraq and could use a nice meal with friends. When someone moved away, it was a big event, and everybody was sad to see them leave.
When I'm sick or need help, my facebook friends send me nice messages. It's not the same.
Damn, I sound old for a guy that's 26.