Because you can grow food there
If there is ever a famine, you will not go hungry -- for there is fertile soil in your backyard and seeds at the hardware store.
Because it doesn’t have to be manicured
Your front yard needs to be mowed on a biweekly basis, the flower beds there need weeding, and the lawn needs to maintain a particular shade of green for the neighbors not to accuse you of lowering property values. The backyard, though, that’s where you can keep all those extra car parts and let the lawn go au naturel, and no one can say a thing.
Because water balloons wreak havoc indoors
A water balloon fight indoors is a disastrous situation, one that might end with a call to a mold remediation specialist, or a sopping wet couch. In the backyard, though, you can recreate the Battle of Helm’s Deep during your water balloon fight, which is totally sick.