I think saying Bitcoin is "really fragile", conjuring images of a shipment of chinaware, is a bit misleading.

One could say the US multi-trillion dollar economy and infrastructure is fragile and defenseless to physical and cyber attacks on its power grid. Yet life goes on.

What's missing is the countermeasure argument. There are all sorts of what-if potential problems all around us, all the time. That doesn't mean we fear getting out of bed each day. What I mean is, sure, Bitcoin isn't perfect nor completely invulnerable to attack, but that can be said for lots of things. However, what I do believe is it's incredibly resilient due to the resourcefulness of its supporters. That counts for a lot.