Sad thing is, if this was in fact simply a horrific accident, the French government has lied and obfuscated so much about past terrorist incidents, a lot of folks ain’t gonna believe anything the French say.
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I read that the Cathedral is owned by the French government, and had been in horrible disrepair - with pieces of stone falling off etc. It was estimated it would cost ~$180 million to repair it, and the French government only have $50 million. The rest had to be raised. Sounds to me like it was neglected for a fairly long time. That is really sad.