The attack on our beloved Holy Father, (didn't a similar thing happen last year?) brings to mind one of the central mysteries of faith, the vulnerability of the Incarnate God, the Word who became Flesh.
As Word and Son He knew all things but experienced nothing. Through the womb of the virgin God experiences dependancy and vulnerability, and ultimately suffering and death. In His Body, the Church, in his priests and in His people, unfortunately sometimes through them, he continues to experience and to suffer.
Of course in the past flanked by the Swiss Guard and carried aloft the Pope was relatively free from mad women.