I don't think the "big deal" is necessarily that it changed, but rather that it was vandalized. For example the Notre Dame fire was certainly very unfortunate and it would be better if it hadn't happened, but ... such things happen, and in that sense it's "not a big deal" (IMHO restoring it as an exact replica is a mistake).
Whether the vandalism was intentional is not entirely clear yet, but a natural disaster damaging or even destroying something is different from humans intentionally doing so through ignorance or malice.
Or let me put it this way: if some natural disaster destroys your car you'd be bummed out and curse at the world for a minute, and then move on as such things happen. The response would be different if I were to wreck your car with a baseball bat.
Whether the vandalism was intentional is not entirely clear yet, but a natural disaster damaging or even destroying something is different from humans intentionally doing so through ignorance or malice.
Or let me put it this way: if some natural disaster destroys your car you'd be bummed out and curse at the world for a minute, and then move on as such things happen. The response would be different if I were to wreck your car with a baseball bat.