Notre Dame is an unusual case in what the building is used for, ownership, etc. The whole issue of taxation and what it pays for is a mine field I’m not going to wade into here. Nor am I so familiar with French politics that I can recite the taxation preferences of the billionaires who have opened up their chequebooks for ND restoration.
I’m simply saying that this is a very generous response by people of substantial means who (at least in the US and, if human behavior extrapolates, France) tend to vote for politicians with a skewed view of what is worth repair and what is not. The ones passed over certainly notice.
Then they vote the same people back into office...