For example, I don't like how big a role oil plays in my life and I would like to be less dependant on it day to day. I'm also trying to grow and raise more of my own food so I'm less dependant on industrial farming and meat production.
Living in a tiny house is a tradeoff that makes it possible to even consider going of grid. I can't imagine trying to design a sustainable off grid power system to great and cool a 3,500 sq.ft. house, designing for 350 sq.ft. is already daunting enough.