It's because for the most part the West has abandoned the Judeo-Christian ethic, that will be the cause of the West's downfall.
Maybe they should leave Notre Dame a ruin as a painful reminder for a society that has turned its’ back on Christ. A kind of call to repentance. If not, make it a museum of what once was. If it’s rebuilt, it will likely go from a building erected to the glory of God to a building erected to the glory of man. (like the tower of Babel)
Stop cherry picking and read the whole post