On a Collision Course
The third rail, in subway-ese, is the rail that is electrified; you touch it, you die. In the political sphere it is often considered to be the social security. Cut benefits and senior citizens, nearly all practicing voters, will swiftly effect your transition to the private sector. But the real third rail seems to be children. The desire of parents to ferociously attack anybody who causes them pain is inbred, like a mother bear protecting their cubs.
On the other side, we have a childless hierarchy, composed of bishops who consider their priests to be their charges, their children as it were.
So what do you get when an irresistable force meets an immoveable object? The "Situation". The right outcome occurred - i.e. the new sexual abuse policy. Now we can say:
Mercy on both their houses!