If life is just one big game and doesn't matter, who cares if we spend money on guns and war instead of food and education? Why does it matter? Why does anything matter?
He isn't talking about 'life' per se, but more about culture, civilization, economy, and all the other bs we created and confuse with life.
Agreed. He's definitely not saying that life is meaningless, but that we accepted the status quo as the only way life can be lived and that we lose so much because of that.
Timeless classic.
One possible answer: because that sometimes, in some way can be fun, too.