I'm so sorry to see the Notre Dame burnt down and I understand what you guy's feeling. Almost 10 years ago, we saw our national treasure burnt down on TV and we could do nothing.
But you know, 'You never lose someone who lives in your heart.'
You are not lose the Notre Dame because it will be recover. Furthermore, it might be good chance to
edit in your modern culture to the Notre Dame for your another 1000 years later's generations.
God bless and cheer up guys...