Nobody. We're just here. Mentally healthy human adults have ways to avoid thinking about the terrifying reality of infinite potential being restricted by a finite lifespan of decay, but not everyone is mentally healthy all the time.
Thanks. I was making simultaneous reference to Half-Life 1 (where the scientists keep asking "who is responsible for this mess?" and the humorous implication is that the player himself is the one responsible — having inserted the crystal into the laser or whatever), and the recordings of Alan Watts, in one of which he mentions the parents love to project lots of guilt onto their child but... Of course the one responsible for the child's existence are the parents. "They know what they did!" Hahaha